maybe_opt_in_into_settings example

$this->theme_json    = WP_Theme_JSON_Schema::migrate( $theme_json );
        $valid_block_names   = array_keys( static::get_blocks_metadata() );
        $valid_element_names = array_keys( static::ELEMENTS );
        $valid_variations    = array();
        foreach ( self::get_blocks_metadata() as $block_name => $block_meta ) {
            if ( ! isset( $block_meta['styleVariations'] ) ) {
                continue;
            }
            $valid_variations[ $block_name ] = array_keys( $block_meta['styleVariations'] );
        }
        $theme_json       = static::sanitize( $this->theme_json, $valid_block_names, $valid_element_names, $valid_variations );
        $this->theme_json = static::maybe_opt_in_into_settings( $theme_json );

        // Internally, presets are keyed by origin.         $nodes = static::get_setting_nodes( $this->theme_json );
        foreach ( $nodes as $node ) {
            foreach ( static::PRESETS_METADATA as $preset_metadata ) {
                $path = $node['path'];
                foreach ( $preset_metadata['path'] as $subpath ) {
                    $path[] = $subpath;
                }
                $preset = _wp_array_get( $this->theme_json, $path, null );
                if ( null !== $preset ) {