HDR and HDCP are completely independent - RPi doesn't even have a certified trust path, so no widevine, HDCP etc.
my fault, i ask this not about Pi4. My AVR (Denon X4100) has HDMI 2.0 but only HDCP 1.4.
If i go from PI --> AVR --> TV i get no HDR.
If i go from PI --> TV i get HDR.
Is it not possible with HDCP 1.4 to get HDR?
I tried a HDCP Converter, but this doesnt work too.