I tried that as a custom formula and using the clay supported "HTTP API" enrichment both of which do not appear to function as I would expect.
The latter is returning a 400
Clay received a 400 error from the API with Content: {"error": true, "message": "INVALID_REQUEST", "details": "Your request JSON can't be parsed, or the request is not POST. Only submit JSON and do not use query parameter."}I thought initially that the body was not being stringify'd but can confirm that it is