Custom vulnerability check - Available parameters to use

Hello all,

Custom vulnerability checks are one of the features that makes me the most exciting about InsightVM.
To leverage this functionality with more efficiency, I was wondering where I can find a list where I can use all the possible xml parameters i can use in vck files.
From the examples I saw that we can use http request etc. but does anyone know where i can find this information?

Thanks,
Emir