Add Custom Attributes and Group Them

// Step 1: Add your custom attribute(s) to a named group

function add_custom_grouped_attributes( $attributes ) {

    // Define your own group label here

    $group_label = 'Other fields';  // e.g., 'Image attributes', 'Custom data', etc.

    // Initialize group if not set

    if ( ! isset( $attributes[ $group_label ] ) ) {

        $attributes[ $group_label ] = array();

    }

    // Add your custom attribute(s)

    $attributes[ $group_label ]['custom_product_flag'] = 'Custom Product Flag';

    $attributes[ $group_label ]['custom_image_url'] = 'Custom Image URL';

    return $attributes;

}

add_filter( 'adt_product_feed_attributes', 'add_custom_grouped_attributes' );

// Step 2: Populate your custom attribute values for each product

function populate_custom_attribute_data( $product_data, $feed, $product ) {

    // Example: get custom meta or ACF field values

    $custom_flag = get_post_meta( $product->get_id(), 'custom_product_flag', true );

    $custom_image_url = get_post_meta( $product->get_id(), 'custom_image_url', true );

    // Assign values to the feed data array with the keys matching the attribute keys above

    $product_data['custom_product_flag'] = $custom_flag ?: '';

    $product_data['custom_image_url'] = $custom_image_url ?: '';

    return $product_data;

}

add_filter( 'adt_get_product_data', 'populate_custom_attribute_data', 10, 3 );