Populate ACF field with list of active Gravity Forms

acf_field_gravity_forms_list.php

<?php
/***
 * Populate ACF field (list_gravity_forms) with list of active Gravity Forms
 ***/

add_filter( 'acf/load_field/name=list_gravity_forms', function( $field ) {
	$forms = GFFormsModel::get_forms();

	// Filter active forms
	$forms = array_filter( $forms, function( $form ) {
		return !rgar( $form, 'is_trash' );
	});

	if ( is_array( $forms ) ) {
		$field[ 'choices' ] = [];
		$field[ 'choices' ][] = 'Select form';

		foreach($forms as $form) {
			$field[ 'choices' ][ $form->id ] = $form->title;
		}
	}

	return $field;
});