The Express 4K+ and the Streambars do not support DV. But there's no issue using a DV capable device on a display that doesn't support DV. It will simply revert to HDR10. They only output DV if the display supports it. If your Sony displays support DV but you don't like it, you can select 4K HDR in the display settings menu on the Roku. That setting should stick.
The Ultra (and maybe the Stick 4K+, I haven't looked) has a setting that turns DV/HDR on for all content (including the menus), but that really should be turned off for accurate video playback. The player just simulates DV/HDR, so isn't really accurate.
Dan
Roku Community Streaming Expert
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