Video Codec SDK 10.0 and ROI Coding in Hevc_nvenc

I tried to use hevc_nvenc for ROI encoding on P4 and T4, but using NvEncGetEncodeCaps API to check NV_ENC_CAPS_SUPPORT_EMPHASIS_LEVEL_MAP, the results are all negative.

I am not a pro, so I am not sure about all of this.

Please tell me whether hevc_nvenc supports ROI encoding?And how to use it if supported?