Get_count with descendants filters

Hi, how to add descendants filter into frappe.client.get_count?

Possible example:

  • return count of item, filtered by its parent_item_group

Target url: {erp_dev_domain}/api/method/frappe.client.get_count
Tried “filters”: {“item_group”: [“descendants of”, “products”]}, its not error but returns incorrect value
Suggestions appreciated, thank you…

ERPNext: v13.9.2 (version-13)
Frappe Framework: v13.9.1 (version-13)