Issue with Fetching Custom Function in Insights - IbisError

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#@staticmethod
    def fetch_uptime_kuma(self):
        """
        Fetch all data from the virtual Doctype 'Uptime Kuma'.
        """
        try:
            # Call the get_list method of UptimeKuma to fetch data
            data = UptimeKuma.get_list()
            # frappe.errprint("data fetched successfully")
            # return data
            formatted_data = {
                "columns": [{"fieldname":"uptime_kuma_name","label":"Uptime Kuma","fieldtype":"Data"}],
                "rows": [{"uptime_kuma_name":d["uptime_kuma_name"]} for d in data],
            }
            return formatted_data
        except Exception as e:
            frappe.log_error(f"Error in fetch_uptime_kuma_data: {str(e)}")
            return {"error": f"Unable to fetch data: {str(e)}"}

I have created a custom app called ‘license,’ and within it, a virtual Doctype named ‘Uptime Kuma.’ I have also created a custom function in the Python file of this Doctype. I want to use this function in Insights, but it throws the following error: insights.api.workbooks.fetch_query_results IbisError."

simply how to use virtual doctype values in insights.