How to specify rules for kwargs

[RainerHeintzmann]

I am trying to specify rrules for functions which are using key word arguments kwargs.
I was looking through the documentation of ChainRulesCore.jl but did not see anything.
Is there an agreed way on how to specify this such that downstram AD systems can use such rrules?
The problem is that one cannot return a mix of non-named and named arguments in the pullback.
Here is a more detailed description of this issue:
https://discourse.julialang.org/t/rrule-or-frule-with-kwargs/114150

[oxinabox]

I am closing this and answering on discourse to avoid fragmenting the response.
We can later open a more specific issue about what (if anything) to do in CRC.