It is about that @wimdows question isn’t obsolete and that i.MX8MQ have capability to stream whatever Librem 5 owner wants it to stream (as ignoring environment in which we live now, in 2023, is not thoughtful nor helpful approach either, although I’m not about to provide any direct help here as still unsure if one exists, as probably non-free related).
EDIT: Encrypted Media Extensions.
EDIT II:
How about: Google Widevine DRM option is grayed out in Purebrowser - #14 by Richard. Nightly version might help but I’m having no time to test this.