以防万一有人来看我，我就是这么做的。首先，我将一个javascript文件排入块编辑器。

add_action( \'enqueue_block_editor_assets\', function () {
    wp_enqueue_style( \'block-editor-styles\',  get_template_directory_uri(\'styles/gutenberg.css\'), false, \'1.0\', \'all\' );
    wp_enqueue_script( \'block-editor-scripts\', get_template_directory_uri(\'scripts/gutenberg.js\'), array( \'wp-blocks\', \'wp-dom\' ), time(), true );
});

wp.domReady( function () {
  wp.blocks.registerBlockVariation(
    \'core/columns\', {
     name: \'two-columns-two-thirds-one-third-eighty-twenty\',
     title: \'80/20\',
     description: \'Two columns; two-thirds, one-third split\',
     icon: \'<svg />\',
     innerBlocks: [
        [\'core/column\', { width: \'80%\' }],
        [\'core/column\', { width: \'20%\' }],
     ],
     scope: [\'block\'],
    }
  );
});