how to pass a query string in useCustomMutation

   const {
      mutate,
      mutation: { isPending },
   } = useCustomMutation<CalcResult, HttpError, { legacy: boolean }>({
      mutationOptions: {
         retry: false,
         mutationKey: ["wizard", "calculate_abrechnung", qs.periode, qs.unit, useLegacy],
         onError: (error) => {
            console.error("Calculate Abrechnung error:", error)
            toast.error(error?.message ?? "Fehler bei der Berechnung")
         },
         onSuccess: (data) => {
            console.log("Calculate Abrechnung success:", data)
            setCalcResult(data.data as CalcResult)
            toast.success("Berechnung erfolgreich")
         },
      },
   })

   const runMutate = () => {
      const url = useLegacy ? `${apiUrl}/api/custom/calculate_abrechnung?legacy=true` : `${apiUrl}/api/custom/calculate_abrechnung`
      console.log("🚀 ~ 04_compute.tsx:136 ~ runMutate ~ url:", url)

      mutate({
         url: url,
         method: "post",
         values: { periode_id: qs.periode, einheit_id: qs.unit },
         config: {
            query: {
               legacy: useLegacy ? "true" : "false", // Query-Parameter für den Legacy-Modus
            }
         },
         meta: {

            
            variables: {
               foo: "bar",
            },
            legacy: "true",
         },
      })
   }

   const {
      mutate,
      mutation: { isPending },
   } = useCustomMutation<CalcResult, HttpError, { legacy: boolean }>({
      mutationOptions: {
         retry: false,
         mutationKey: ["wizard", "calculate_abrechnung", qs.periode, qs.unit, useLegacy],
         onError: (error) => {
            console.error("Calculate Abrechnung error:", error)
            toast.error(error?.message ?? "Fehler bei der Berechnung")
         },
         onSuccess: (data) => {
            console.log("Calculate Abrechnung success:", data)
            setCalcResult(data.data as CalcResult)
            toast.success("Berechnung erfolgreich")
         },
      },
   })

   const runMutate = () => {
      const url = useLegacy ? `${apiUrl}/api/custom/calculate_abrechnung?legacy=true` : `${apiUrl}/api/custom/calculate_abrechnung`
      console.log("🚀 ~ 04_compute.tsx:136 ~ runMutate ~ url:", url)

      mutate({
         url: url,
         method: "post",
         values: { periode_id: qs.periode, einheit_id: qs.unit },
         config: {
            query: {
               legacy: useLegacy ? "true" : "false", // Query-Parameter für den Legacy-Modus
            }
         },
         meta: {

            
            variables: {
               foo: "bar",
            },
            legacy: "true",
         },
      })
   }