[exim] make imap query in exim

Hello,

I want to make an imap query to my imapd daemon from exim
how can I implement it from a router or in acl ?

at least , if I could run a script in a router , and use the output in
the condition tag?

I have googled around , but I haven't found what I am looking for.

does someone know how to make it ?

thank you very much for you help

best regards
Patrice