Where to find documentation for CPT block template? (PHP)

You can’t find that documentation because it doesn’t exist. It doesn’t exist because that’s not how it works, and it would require extensive duplication to set up. So to figure out what you need to put, figure out what it is in Javascript/JSON, then translate it to PHP. The pattern is: [ ‘block name’ [ … Read more

Register multiple styles / scripts in register_block_type

Not supported yet, see the corresponding Github Issue. I found a workaround in order to at least register additional block styles: register_block_style( ‘create-block/myblock’, array( ‘name’ => ‘style2’, ‘label’ => ‘Style 2’, ‘style_handle’ => ‘create-block-myblock-style-2’, ) );