If you choose to build your pattern in the Block Editor, you simply need to add necessary blocks to a post or page draft, then switch to the Code Editor and copy the corresponding code.

We can now register our pattern in the child theme’s functions.php file:

add_action( ‘init’, function(){

register_block_pattern_category(

‘custom-patterns’,

array( ‘label’ => esc_html__( ‘Custom patterns’, ‘twentytwentyone-child’ ) ) );

register_block_pattern(

‘twentytwentyone-child/custom-bio-pattern’,

array(

‘title’ => __( ‘Author Bio’, ‘twentytwentyone-child’ ),

‘description’ => _x( ‘A block with 2 columns that displays an avatar image, a heading and a paragraph.’, ‘Block pattern description’, ‘twentytwentyone-child’ ),