function wpf_batch_gforms_init() {

    $entry_ids = array();

    $feeds = GFAPI::get_feeds( null, null, 'wpfgforms' );

    if ( empty( $feeds ) ) {
        return $entry_ids;
    }

    $form_ids = array();

    foreach ( $feeds as $feed ) {
        $form_ids[] = $feed['form_id'];
    }

    $entry_ids = GFAPI::get_entry_ids( $form_ids );

    return $entry_ids;

}

add_filter( 'wpf_batch_gravity_forms_init', 'wpf_batch_gforms_init', 20 );