While I haven't really looked into Mojo very deeply. I recently ran into a Module by Damian Conway : Smart::Comments

If I understand you correctly, I think it just might hit the spot.

It allows you to create "progress bars" in a flexible way. But is not limited to presenting feedback this way. It allows for some very creative ways of reporting states, or progress, at pretty much anytime.

Best wishes.

--Chris

#!/usr/bin/perl -Tw
use Perl::Always or die;
my $perl_version = (5.12.5);
print $perl_version;