okay alright! So this all has to be hardcoded into the WAF expression correct?

    // Fetch the resource using childWorker1
    const childWorker1Response = await env.childWorker1.fetch(request.clone());

    // Fully consume the response body of childWorker1
    const childWorker1ResponseBody = await childWorker1Response.text();

    // Fetch a resource using childWorker2, passing the response body of childWorker1 as the POST body
    const childWorker2Response = await env.childWorker2.fetch(request.clone(), {
      method: 'POST',
      body: childWorker1ResponseBody
    });

    // Fetch the resource using childWorker1
    const childWorker1Response = await env.childWorker1.fetch(request.clone());

    // Fully consume the response body of childWorker1
    const childWorker1ResponseBody = await childWorker1Response.text();

    // Fetch a resource using childWorker2, passing the response body of childWorker1 as the POST body
    const childWorker2Response = await env.childWorker2.fetch(request.clone(), {
      method: 'POST',
      body: childWorker1ResponseBody
    });