[config] Merged dev overrides from config/gutenberg-block-api.dev.json
URL: https://developer.wordpress.org/block-editor/reference-guides/block-api/block-metadata/
Starting with the WordPress 5.8 release, we recommend using the block.json metadata file as the canonical way to register block types with both PHP (server-side) and JavaScript (client-side). Here is an example block.json file that would define the metadata for a plugin create a notice block.
Example: