I don’t know if its possible to connect it to a certain page template , it would be great if it was possible. But at least its possible to set predefined blocks to a post or page or custom post type.
Just add this function:
function myplugin_register_template() {
$post_type_object = get_post_type_object( 'page' );
$post_type_object->template = array(
array( 'acf/block1' ), // the name of your block
array( 'acf/block2' ), // the name of your block
);
}
add_action( 'init', 'myplugin_register_template' );