If you are looking for a standalone file for a downloaded version, checking community forums like is your best bet, though native Portuguese subtitles for Brazilian shows are rarely uploaded there.
: As the original producer, Globoplay provides all episodes of Season 1 (64 chapters) with native Portuguese captions. Verdades Secretas subtitles Portuguese (BR) S01E43
Instead, you can access Portuguese captions and subtitles directly through official streaming platforms: If you are looking for a standalone file