Thank you!
The enqueue_block_editor_assets
hook is what I am using now. Code Example:
function _akdev_mbBlockScripts()
{
wp_enqueue_style(
'_akdev-ctaBlock',
get_template_directory_uri().'/inc/mb-block-templates/cta.css',
);
}
add_action('enqueue_block_editor_assets', '_akdev_mbBlockScripts');