For instance interactive resources where you have to solve tasks to gain points to finish a level.

see also Free eLearning material for Perl?

Many companies don't have the resources for a real training of their employees, it would be a bless if you could point them to a "challenge" where they need to understand something like "auto-vivification" or how strict helps tracking errors.

The perldocs are in a pity state, because it's often complicated to track and understand the most relevant information. It's more quantity then quality, written by many people with good intentions.

Academics want a kind of orthogonality, Perl has many explicit and orthogonal features which are lost in a lot of secondary information. Academics train teachers, teachers write training material for their pupils, that's why you will find plenty of Python stuff.

Perlmonks used to be state of the art in eLearning when it started (so called "collaborative learning").

Combine an (extended) Modern Perl with interactive exercises and hot links to Perlmonks and companies will have less worries how to find Perl programmers.

update

see https://www.coursera.org/courses?query=Python , if you search for Perl instead, you'll only get other resources mentioning Perl (mostly Python).