Short answer
The D8 digital nomad visa is for remote workers with foreign income; Brazilians apply through the Portuguese consulate in Brazil. You'll need proof of remote work and income above a minimum threshold (linked to the Portuguese minimum wage), plus accommodation and insurance. It's typically temporary and renewable, and can lead to residency. Rules and amounts change, so confirm current requirements with the consulate or AIMA.
General information, not legal or tax advice. Rules and amounts change: confirm with official sources.