I can confirm that I can play Dolby Vision content from an Xbox One through the 976 to an LG C7. The Xbox One doesn't play Dolby Vision from disc content but the streaming apps that support DV do play.
The 976 is capable of switching Dolby Vision sources on its (4) HDMI 2.0b / HDCP 2.2 inputs and (1) output.
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Outlaw Audio Model 976 / 7700 / Ultra-X13
B&W CM9, CM Center, DS3 (side), DM303 (back)
Blue Jeans Cables (XLRs, Canare 4S11 Bi-wire, HDMI)
Tivo Bolt, Xbox Series X, Panasonic ub820, AppleTV 4k, LG C765P
Roon, Allo Digione Signature, Sonore MicroRendu, Uptone Audio LPS-1, Peachtree Audio Nova 150
GIK Acoustics Soffit Bass Traps, 244 Panels, Monster Bass Traps, QRD7 / Polyfusor Diffusers