First off, thanks very much for your work. :) Given how this is also used in VSCode and by GitHub for syntax highlighting, it has a lot of value to the Perl community.
Would you be open to adding one (or more?) competent Perl developers to help manage this specific repository? I'm fairly sure I could get some time at my $work scheduled to help get through the backlog as this would allow us to address at least one pain point (indented heredocs) that affects us at @maxmind.