ACF Load layouts into flex field

load.php

<?php
add_filter( 'acf/load_field/name=flex_layout', __CLASS__ . '::craft_content_layouts' );

static function craft_content_layouts( $field ) {

  // Remove the layouts
  // that are named in this list
  $remove_list = [
    'paragraph',
    'banner',
  ];
  foreach ( $field['layouts'] as $i => $layout ) {
    if ( in_array( $layout['name'], $remove_list ) ) {
      unset( $field['layouts'][ $i ] );
    }
  }

  /**
   * Load another AC Flex field into this layout mix
   */
  // $additional_fields = acf_get_fields( 'additional_flex_field' );
  // foreach ($additional_fields['layouts'] as $layout) {
  //  $field['layouts'][] = $layout;
  // }
  return $field;
} );

Thank you! it is working properly.

Due I wasn't able to load a single field using acf_get_fields but it was loading acf groups, I fixed loading additional layouts using a previously created acf group and it's working:

add_filter( 'acf/load_field/key=field_60f57a54a887b', 'myfuncaddlayout' );

function myfuncaddlayout( $field ) {

if(array_search('mycustomfieldname', array_column($field['layouts'], 'name')) === false){
  $additional_fields = acf_get_fields( 'group_63d777aa87ad7' );
  foreach ($additional_fields as $newfield) {
    foreach ($newfield['layouts'] as $layout) {
      $field['layouts'][] = $layout;
    }
  }
}

return $field;

} );