queryCoupons() query syntax for sorted fields

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I’m having trouble with

queryCoupons() backend method query syntax

Working in
Dev Mode

What I’m trying to do
Return results that are sorted / filtered by field

**What I’ve tried so far

// this query works as expected**

import { elevate } from "wix-auth";import { coupons as c } from "wix-marketing.v2";

export async function get_coupons_v2(){

const query = {
"paging": {
"limit": 50,
"offset": 0}
}   
 const el = elevate(c.queryCoupons)
    const result = await el(query)
return result

// adding different variations based on
// API Query Language
// leads to errors like

message: Unexpected value for StringValue details: applicationError: description: Bad Request code: BAD_REQUEST data: {}