Use the rwmb_{$field_type}_value filter with sub-fields

Hi,

I'm trying to encrypt ALL the password fields before saving them in DB using something like this:

function my_encrypt_function ( $new ) {
    $secret_key    = 'XXXXXXXXXXX';
    $secret_vector = 'YYYYYYYYYYY';
    $key           = hash( 'sha256', $secret_key );
    $vector        = substr( hash( 'sha256', $secret_vector ), 0, 16 );

    return base64_encode( openssl_encrypt( $new, 'AES-256-CBC', $key, 0, $vector ) );
};
add_filter( 'rwmb_password_value', 'my_encrypt_function' );

But this is not working when the password field is a sub-field inside a group field:

$meta_boxes[] = [
    'title'  => 'My fields',
    'id'     => 'my_fields',
    'fields' => [
        [
            'id'     => 'my_group',
            'type'   => 'group',
            'fields' => [
                [
                    'name' => 'My Password',
                    'id'   => 'my_password',
                    'type' => 'password',
                ],
            ],
        ],
    ]
];

Is there any other filter or way to do the same?