How to set column widths in a CPT block template?

I have a block template for a custom post type. When the WP Core column block added support for different widths, I tried setting up the template like so (I changed the post type to “post” here in case anyone else plans to try it out): <?php add_action(‘init’, ‘wpse_register_post_template’); function wpse_register_post_template() { $post_type_object = get_post_type_object(‘post’);…