OVM Rest API - looking for features of the UI, but do not find them in API (ISO, PXE etc)

I would like to implement a PXE boot environment in PCA using the OVM Rest API. Basically I woul do two major steps: 

- Import tISO files or DVDs to a Repository via API Call

- create a VM using PXE or DVD option via API Call 

I'm facing these issues: 

a) Import ISO

From the OVM Rest API Doc which I extracted from the OVM ISO itself, I cannot find any way to import ISOs (just vDisks, VMs and Assemblies seem to be supported by the API)

b) create a VM with boot option PXE/DVD

GIven the fact that my ISO is stored in the repo (which ever way it got imported), would I have to put together a JSO body like this to let an API call do the creation: