I deliberately asked an open question, but let me elaborate further

One is able to ...

• share stuff (links, text) with termux
• scripts in the bin directory can handle those shared things
• install cpan modules
• forward a link to android's browser
• start a Web server listening on local host

Isn't that pretty much all you need to write an "App" in Perl?

Example?

Well what about a Perlmonks-App hosted on CPAN? :)