Discover the data given by the 'block_type_metadata_settings' filter.

block_type_metadata_settings.php

<?php

add_filter(
		'block_type_metadata_settings',
		static function( $settings, $metadata ) {
			if (
					! isset( $settings['parent'][0] ) ||
					'core/navigation' !== $settings['parent'][0]
			) {
				return $settings;
			}
		
			?>
			<h2>block_type_metadata_settings</h2>
		
			<h3>Settings</h3>
			<pre>
			<?php var_dump( $settings ); ?>
			</pre><br>
		
			<?php
			return $settings;
	},
	10, 2
);