Add stock status to product schema

stock-status-to-schema.php

<?php
add_filter( 'cm_tsfwc_product_fields', 'your_slug_add_stock_status_to_schema' );
 function your_slug_add_stock_status_to_schema( $product_fields ) {
     $product_fields[] = [ 'name' => 'stock_status', 'type' => 'string' ];
     return $product_fields;
 }
 add_filter( 'cm_tsfwc_data_before_entry', 'your_slug_add_data_before_entry', 10, 4 );
 function your_slug_add_data_before_entry( $formatted_data, $raw_data, $object_id, $schema_name ) {
     if( $schema_name === 'product' ) { // only add data if the schema is product
         $stock_status = $raw_data->get_stock_status();
         $formatted_data['stock_status'] = $stock_status;
     }
     return $formatted_data;
 }