Right now it's not packaged up for easy use but KDE has supported Raspberry Pi's for ages so I wouldn't be surprised if you ran Plasma desktop, it'd be simple to build and install. I'd wait until they got it back onto the KDE release cadence with everything else though for simplicity

For anyone who wants to test this out, you can do as Devin did by installing Plasma Bigscreen on a Raspberry Pi using postmarketOS, though you would have to compile it yourself or pull from the nightly repos to get the latest changes.