POST request, can't get answer in JSON

hello, i'm trying to use an external tool and I get an answer in JSON. I'm making a post request and I'm getting in answer "object object" and it seems that I can't change that, could you help me?

I tried the exact same request on a similar platform of yours and it's working, I get my answer in form of a text in the chatbot but I prefer yours as you can handle human answers