MocapNet has the ability to work with OpenPose JSON 2D data and convert it to Bio Vision Hierarchy (BVH) format for use in Blender. It’s not an addon, but rather a program in Linux.
MocapNET supports conversion of body bones only?
In addition to body bones MocapNET can probably do fingers and face markers too. OpenPose does all three, as does Mediapipe. Have used only body bones in MocapNET so I’m not sure of other details. In the pictures on their website fingers and face markers appear too. Only fingers and face markers are currently available in the Mediapipe close2animation plugin for Blender, though body bones are planned soon.