Heya @Jan_Go, Michaela from Integromat here
Since there’s no native way of achieving this, you could also make it work with Integromat. It’s a no-code platform that lets you connect Asana to almost any other app and automate all kinds of processes.
You can check out the Asana and Evernote integrations to see what the options are (the integration pages include the lists of available features, i.e. triggers, actions, and pre-made templates, for both services).
Anyway, for your use case, it would be the classic “watch notes” → “create a task” combo