@anonymoustly - Unfortunately there is no current support - but a solution could be done if someone from the community took it on themselves to code an arm64/armhf compatible extension for it, based on the one available for Linux Chrome. UBports would not be able to directly support or offer this though, due to legal licensing issues - but if a third party hosted it then UT users could choose to install it. Until someone capable of coding this undertakes the effort then Widevine support will be missing though.
Best regards,
Steve Berson