Can concrete5 controllers render html blocks or sections on themed pages in package?

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Has any one tried and successfully made concrete5 controllers to render HTML pieces of code on themed (styled) and templated pages similar to Symfony's blocks in twig or Laravel's sections in blade? And most importantly all that in a package.

Instruction here:
https://documentation.concrete5.org/developers/framework/routing/vie...

don't work in packages.

linuxoid