How can I share a New Quiz or item bank with myself, working in 2 schools, with 2 different Canvas accounts?

I work in 2 different schools, teaching the same subjects.

Sharing with Commons, exporting and importing isn't difficult, except for new quizzes:
it seems impossible to share with commons, to export, ... 

Is there a possibility to use the new quizzes in both schools, without creating them manually all over again?