If one is not sure how to help maybe lets try to do it this way:
Take a look at this sample topic Another call function from custom element question
The docs for it are clearly not enough. Once the topic has enough satisfying answers one can pick it up ans create a PR rephrasing the docs, adding more samples. After that post the link to the PR back to the discourse topic. That way more people will review the PR and chances are we get that done in a way with having the feature fully and easily documented.