How to enable 'Transfer-Encoding: Chunked' for RESPONSE

I read in this forum that somebody wanted to force the ‘Content-Length: nnn’ header instead of ‘Transfer-Encoding: chunked’. I forced instead the ‘chunked’ header for the RESPONSE by means of the Add (+ green sign) header option in the Response window, then increased the response size and it worked finally as expected. I can see for every chunk its size and then its contents in the ‘HTTP Log’ tab. Please see attached pics.

Thanks.

Mariana.