You can search for identifiers within the package.
in-package search v0.2.0
count_genargs_plugin.ml
1 2 3 4 (* generated by dune *) (** @canonical Count_genargs_plugin.Main *) module Main = Count_genargs_plugin__Main
1 2 3 4
(* generated by dune *) (** @canonical Count_genargs_plugin.Main *) module Main = Count_genargs_plugin__Main