> As far as I’m aware, Widevine is the only available DRM for a Chromium-based browser, especially so for Electron.

But according to this [0] the Chromium-based Edge browser supports both Google's WideVine CDM and Microsoft's PlayReady CDM. Not sure if it's really any help, but that's a different question.

[0] https://github.com/google/shaka-player/issues/2492#issuecomm...