register_block_core_footnotes_post_meta()

86function register_block_core_footnotes_post_meta() {87	$post_types = get_post_types( array( 'show_in_rest' => true ) );88	foreach ( $post_types as $post_type ) {89		// Only register the meta field if the post type supports the editor, custom fields, and revisions.90		if (91			post_type_supports( $post_type, 'editor' ) &&92			post_type_supports( $post_type, 'custom-fields' ) &&93			post_type_supports( $post_type, 'revisions' )94		) {95			register_post_meta(96				$post_type,97				'footnotes',98				array(99					'show_in_rest'      => true,100					'single'            => true,101					'type'              => 'string',102					'revisions_enabled' => true,103				)104			);105		}106	}107}