problem initializing a text field value in a block.

Hi,
I want to initialize a text field in a block with a value stored in a custom post meta field which is calculated at 'rwmb_after_save_post' hook. At the beginning, I tried to change the value of the block's text field using str_replace() in 'post_content' but I had some problems with incongruities between the value stored in the database ('post_content') and the value in the browser('The backup of this post in your browser is different from the version below.'). So, I decided to initialize the value using javascript but I have a problem to set the value in the js code. I am using: $('#my_block_text_field').val('the_value_to_set'). Can you help me how to do that?
You can find attached the block and fields definitions, the php enqueue script function code, and js code.

<?php
add_filter( 'rwmb_meta_boxes', 'your_prefix_register_meta_boxes' );

function your_prefix_register_meta_boxes( $meta_boxes ) {
    $prefix = '';

    $meta_boxes[] = [
        'title'    => esc_html__( 'Test BLCK', 'text-domain' ),
        'id'       => 'test-blck',
        'fields'   => [
            [
                'id'   => $prefix . 'text_hdsmywqrchf',
                'type' => 'text',
                'name' => esc_html__( 'Text Field Test BLCK', 'text-domain' ),
            ],
            [
                'id'         => $prefix . 'taxonomy_advanced_yhwon6kcqb',
                'type'       => 'taxonomy_advanced',
                'name'       => esc_html__( 'Taxonomy Advanced Field', 'text-domain' ),
                'taxonomy'   => 'test-type',
                'field_type' => 'select',
            ],
            [
                'id'                => $prefix . 'text_ey3ewpvlke',
                'type'              => 'text',
                'name'              => esc_html__( 'Amount text field', 'text-domain' ),
                'size'              => 16,
                'columns'           => 6,
                'sanitize_callback' => 'xn_sanitize_money_field',
            ],
            [
                'id'       => $prefix . 'text_41r32ufnhu8',
                'type'     => 'text',
                'name'     => esc_html__( 'Calculated Amount', 'text-domain' ),
                'size'     => 16,
                'columns'  => 6,
                'readonly' => 1,
            ],
            [
                'id'      => $prefix . 'radio_e0432gtno2d',
                'name'    => esc_html__( 'Radio Test', 'text-domain' ),
                'type'    => 'radio',
                'std'     => 'no',
                'options' => [
                    'yes' => esc_html__( 'Test 1', 'text-domain' ),
                    'no'  => esc_html__( 'Test 2', 'text-domain' ),
                ],
                'class'   => 'radiostyle',
                'columns' => 12,
            ],
        ],
        'category' => 'layout',
        'icon'     => 'admin-appearance',
        'type'     => 'block',
        'mode'     => 'edit',
    ];

    return $meta_boxes;
}

This is the php code in my functions.php which is passing ok the params to javascript.

function test_enqueue_scripts( $hook_suffix ) {
        if( in_array($hook_suffix, array('post.php', 'post-new.php') ) ){
            $screen = get_current_screen();
            if(is_object( $screen ) && ('test-pt' == $screen->post_type)){
                    $post_type_object = get_post_type_object( 'test-pt' );
                    $post_id = $post_type_object->ID;
                    // percentage value stored in post meta
                    $pct_test = rwmb_meta('number_uqjo7f193f', ['object_type' => 'post'], $post_id );
                    // calculate the value to be passed to javascript
                    $result = (empty($pct_test)) ? 0 : $pct_test;
                    wp_register_script('test_script', get_stylesheet_directory_uri() . '/test.js', array('jquery'),'1.1', true);
                    // ****
                    // prepare an array to be used by Javascript code
                    // ****
                    $ajax_url = admin_url( 'admin-ajax.php' );
                    $wp_nonce = wp_create_nonce( 'wp_rest' );
                    $array_params = array( 
                            'ajax_url' => $ajax_url,
                            'wp_nonce'=> $wp_nonce,
                            'result' => $result,
                        );
                    wp_localize_script( 'test_script', 'params_object', array ('json_params' => json_encode($array_params),));
                    wp_enqueue_script( 'test_script' );   
            }
        }   
}
add_action( 'admin_enqueue_scripts', 'test_enqueue_scripts' );

And this is my javascript code:

jQuery(document).ready(function($) {
    var myParamsStr = JSON.stringify(window.params_object);
    if (myParamsStr) {
        console.log(myParamsStr);
        var x = JSON.parse (myParamsStr);
        console.log(x);
        var y = JSON.parse (x.json_params);
        console.log(y);
        console.log(y.ajax_url);
        console.log(y.wp_nonce);
        console.log(y.result);
        $('#text_41r32ufnhu8').val(y.result); 
    }
});