No. Sony committed to "only" support Dolby Vision as premium HDR format for now.
I really think you should not bother at all, neither with HDR10+ nor Dolby Vision. Current high-end Sony TVs do not rely on dynamic metadata. The X1 Extreme processor analyzes video content on a frame-by-frame basis and adjusts brightness/contrast accordingly even for HDR10. You won't be able to spot much of a difference anymore.
