If you have a large tank, with a lot of decoration breaking up territory lines, and you end up with either very peaceful individuals or females, it is possible to keep these species together. But it is not a risk that I would take. It is really not fair to either fish to experiment with them.
I tried 3 spot gourami with angelfish once in a 200l tall. The gouramis went back after a few days as the angels would not tolerate them. Bad call on my part. I do think angels and gourami could work in the right setting.