Welcome to the community and thanks so much for your suggestion.
Some communities (Kinyrwanda and Frisian) have worked with local government to support community campaigns and activities in Common Voice.
Currently all language corpus’ that take part of Common Voice are under CC0. Some language communities have previously worked with copyright owners in media to grow sentences which are part of the languages corpus. They have followed with community mobilisation encouraging people to contribute and validate voice clips by reading out these sentences.
I would like to suggest the following steps currently available to you:
Insure the text you want to contribute is under cc0 or is dedicated to it (check out the cc0 waiver process)
You can do a bulk submission for Protugese and validate the sentences before submitting them onto the website before voice clip collection.
Moblie colleagues and community members to contribute and validate voice clips
You might be intrested reading about this blog reagrding the introduction of variants for languages.
If you have any other questions please let me know.