We have a course with many quizzes ( next and H5P). 
We want to add the quizzes to the learning outcomes, to provide students with some kind of progression indication.

Can some tell me how to do this?

All i can see is adding individual questions to the learning outcomes. 
We need to add whole quizzes ,and LTI-quizzes like H5P.

Yours sincerely,

Martijn