[exim] personal aliases via flat file?

Enumerating every single alias for personal in the .forward file is a
bit of a pain so is there a way this can be defined by flat file?

ie.

if personal alias a
         alias b
    alias c
    alias d
    alias e
    alias f
    alias g

instead have

a
b
c
d
e
f
g

in a flat file