Apple 4K TV - How to set Chroma 4:2:2 with Format 4KSDR (@ 60Hz)

I have an Apple 4K TV, 3rd generation connected via a certified 18GBs cables first to a Denon AVR-S930H and from there to a Sony X900F TV, both which have HDMI 2.0b connections. The TV has Enhanced mode enabled. In the Apple Video settings, when selecting Format 4KSDR (@ 60Hz) and HDMI Output YCbCr, Chroma only displays options for 4:4:4 and 4:2:0, but not the in between 4:2:2 value. What I find odd is if you select Format 4KHDR (@ 60Hz) and HDMI Output YCbCr, Chroma only displays options for 4:4:2 and 4:2:0. The options for 4KHDR appear to be correct, since HDR requires 10-bit color depth and 4:4:4 for 10-bit is not supported at 60Hz as per the HDMI 2.0 spec. I have both Match Content (Range and Frame Rate) enabled, thus why I have Format 4KSDR (@ 60Hz) selected. I would think that selecting 4:4:4 would be incorrect for 4KSDR (@ 60Hz) if the enabled Range setting switches to 10-bit HDR based on content. I do not want to use the other setting 4:2:0 since I may have a source with 4:2:2 content.

There is no documentation available that explains what Apple does if the selected settings exceed the 18 GBs limit-- if 4K 60Hz HDR content is received (with Chroma set to 4:4:4), does it automatically switch down to either Chroma 4:2:2 or 4:2:2, or does it downgrade the frame rate to 30Hz? From one article I found pertaining to the HDMI Specification, 4K 60Hz will work with RGB, 4:4:4, 4:2:2 and 4:2:0 at 8-bit color depth, but at 10-bit (which is what HDR requires) it will only work at 4:2:0.

Does anyone have any comments concerning this?