[Question] How to use customized grid type with PNanoVDB?

[Enigmatisms]

Is there any way to use customized grid type with PNanoVDB?

I implement a new type of voxel (which won't fit in a Vec4d), and I want to port it into the Slang shader via PNanoVDB API. But I find that PNanoVDB depends on the pre-defined voxel type, and each grid_type has so many related strides and offsets that are written as compile-time constants (with unclear meaning, since there is no comments in PNanoVDB.h), for example line 1637: pnanovdb_grid_type_constants. Does this mean that PNanoVDB is just a portable version of NanoVDB which only accepts common data structures?