Thank you!
perhaps try reporting to the Portuguese ombudsman: https://www.provedor-jus.pt/en/ . No idea how effective it is.
Discussion
In particular: https://www.provedor-jus.pt/en/national-preventive-machanism/the-ombusdman-as-national-preventive-mechanism/
They do visits of prisons, in theory to detect/prevent torture, but not sure if they would visit the prison just because of 1 person. And which prison?
So there is some relation between ombudsman's role and this case, not sure how strong.
Thank you! I spoke with them yesterday and they‘ll see if they can help us