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If you're talking about the position of the HoloLens device. Usually, we will get it by accessing the position of the Pawn Actor, since you mentioned that you don't want to use Pawn, it is recommended that you ask Unreal if there is another way. As for the APIs in Unreal for getting HMD data, I'm not an expert on Unreal. It is recommended that you ask Unreal if these APIs support HoloLens 2, and if they support Holographic Remoting.
If you're talking about the P/V camera in HoloLens 2. It does not support Holographic Remoting, please refer to HoloLens Photo/Video Camera in Unreal - Mixed Reality | Microsoft Learn.
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