Populate the_content in the WYSIWYG field to GF Add-on

Hello,

I would like to populate the_content of spécific post in my form.

add_filter("gform_pre_render", "populate_fields");
add_filter("gform_admin_pre_render", "populate_fields");

function populate_fields($form){

    //only populating drop down for form id 12
    if($form["id"] != 12)
       return $form;
	$id_factory = $_GET['id_factory'];
	$form["fields"][0]["defaultValue"] = get_post_field( 'post_title', $id_factory, 'display' );
	$form["fields"][1]["defaultValue"] = get_post_field( 'post_content', $id_factory, 'display' );

    return $form;
}

For the title it's ok, but the_content that's not load...

Any idea ?

Thanks