What is the best way to call rdf_assert from C?

I would like to assert a fair amount of facts directly into the rdf db from
a C extension. I guess the straightforward way is to construct the
rdf_assert term and then do PL_call. Presumably this will go through dwim,
module processing and other overhead etc per call. I wonder if there is a
better way. Ideally I would get a handle to the C function directly.

Thanks,
Haitao
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