bb-pre-populate page with template

bb-pre-populate-page-template.php

// Uses the add_meta_boxes_{post_type} hook for given post type
// change page in hook to your post type where you want this to happen

add_action( 'add_meta_boxes_page', 'page_default_content' );

function page_default_content( WP_Post $page ) {
// Add the meta data fields you want the custom post type to grab
$page_meta_data = [
'_fl_builder_enabled',
'_fl_builder_data_settings',
'_fl_builder_draft_settings',
'_fl_builder_draft',
'_fl_builder_data'
];

foreach ( $page_meta_data as $meta ) {
// Using a 'template' with ID of 17
$data = get_post_meta( 17, $meta, true );
add_post_meta( $page->ID, $meta, $data );
}
}