Add custom fieldtype to supported ACF fields

add_action( 'init' , 'add_custom_supported_fieldtype' );

/**
 * Add a new fieldtype-name to the supported field_types
 */
function add_custom_supported_fieldtype() {

    // bail early if plugin has been deactivated or isn't installed
    if ( !class_exists( 'easy_acf_connect' ) ) return;

    easy_acf_connect::$supported_acf_field_types = array_merge(
                                                                easy_acf_connect::$supported_acf_field_types,
                                                                array( 'image_aspect_ratio_crop' )
                                                    );

}