admin API & scheduled refreshes

Dear community

I am perfectly able to get a list of all scheduled refreshes of my own datasets. However, there seems not to be such a thing on the admin API. Also, the activitylog API does not help: it will only give me refreshes on demand.

Ideally, I want to know about all scheduled refreshes (dates, times) and the ones on demand. Also i would like to know which refreshes require use a certain gateway.

Can anyone help how to get this information? I seem to be stuck