Add ACF inside of your plugin

acf_in_custum_plugin.php

if( ! defined( 'ABSPATH' ) ) exit; // Exit if accessed directly
/*found: https://support.advancedcustomfields.com/forums/topic/include-acf-to-my-plugin/*/
/** Start: Detect ACF Pro plugin. Include if not present. */
if ( !class_exists('acf') ) { // if ACF Pro plugin does not currently exist
  /** Start: Customize ACF path */
  add_filter('acf/settings/path', 'cysp_acf_settings_path');
  function cysp_acf_settings_path( $path ) {
    $path = plugin_dir_path( __FILE__ ) . 'acf/';
    return $path;
  }
  /** End: Customize ACF path */
  /** Start: Customize ACF dir */
  add_filter('acf/settings/dir', 'cysp_acf_settings_dir');
  function cysp_acf_settings_dir( $path ) {
    $dir = plugin_dir_url( __FILE__ ) . 'acf/';
    return $dir;
  }
  /** End: Customize ACF path */
  /** Start: Hide ACF field group menu item */
  add_filter('acf/settings/show_admin', '__return_false');
  /** End: Hide ACF field group menu item */
  /** Start: Include ACF */
  include_once( plugin_dir_path( __FILE__ ) . 'acf/acf.php' );
  /** End: Include ACF */
  /** Start: Create JSON save point */
  add_filter('acf/settings/save_json', 'cysp_acf_json_save_point');
  function cysp_acf_json_save_point( $path ) {
    $path = plugin_dir_path( __FILE__ ) . 'acf-json/';
    return $path;
  }
  /** End: Create JSON save point */
  /** Start: Create JSON load point */
  add_filter('acf/settings/load_json', 'cysp_acf_json_load_point');
  /** End: Create JSON load point */
  /** Start: Stop ACF upgrade notifications */
  add_filter( 'site_transient_update_plugins', 'cysp_stop_acf_update_notifications', 11 );
  function cysp_stop_acf_update_notifications( $value ) {
    unset( $value->response[ plugin_dir_path( __FILE__ ) . 'acf/acf.php' ] );
    return $value;
  }
  /** End: Stop ACF upgrade notifications */
} else { // else ACF Pro plugin does exist
  /** Start: Create JSON load point */
  add_filter('acf/settings/load_json', 'cysp_acf_json_load_point');
  /** End: Create JSON load point */
} // end-if ACF Pro plugin does not currently exist
/** End: Detect ACF Pro plugin. Include if not present. */
/** Start: Function to create JSON load point */
function cysp_acf_json_load_point( $paths ) {
  $paths[] = plugin_dir_path( __FILE__ ) . 'acf-json-load';
  return $paths;
}
/** End: Function to create JSON load point */