This is pretty tough because Portugal is one of the countries in Europe that doesn’t frequently have subtitles available for TV programs.
That said, RTP Play has some shows which do have subtitles available. My favorite in terms of the level of dialogue being understandable is O Sábio, but the show itself is honestly pretty terrible (sorry if you like telenovelas – not a fan myself!). That said, if you want a lot of content, this is a treasure trove as they have 364 episodes available!
There’s a funny political comedy called Os Boys which also has subtitles, though the dialogue is much more difficult and there isn’t nearly as much content.
You can find some children’s TV shows on Netflix dubbed into European Portuguese. For example, Spongebob Squarepants is available on Netflix. The Portuguese do not like dubbing content aimed at adult audiences so you will typically only find children’s shows this way.