[Exim] different .forward format for forward transport

Hello there!!!

Is it possible to specify my own .forward format file? i have a host
with many virtual domains, and users aren't actually exist anywhere
in a passwd file. so i wanted to use one forward file for all the
domains with some kind of this syntax:
test1: test1@???
dot: hello@???

i.e. some kind of aliases format. or may someone tell me, which
transport could be used for the best to realize this?

--
...WBR, Roman Hlynovski (dr@???)