LLD with combined keys?

[ik_zelf]

Hi,

is it possible to use LLD for a discovery with combined keys?
For example, I want to monitor the count of some process names per user.
So I would have a discovery key usr.proc
and an item prototype like usr.proc[{#USR},{#PROCNAME},count]
or: how should I handle that, if possible at all?

thanks,
Ronald.