Adding a calculation to Charts using the API

If would be very valuable to be able to create a Charts with timeseries AND calculations via the API. This is relevant when you want to create a large number of charts with calculations, like monitoring all instances of an equipment type, or creating a Charts on-the-fly based on an situation that is detected.

Today you can build up a URL where you specify the timeseries and the time range, and when you open the URL you can create a new Charts or add the timeseries to an existing Charts. But I do not see any way of adding a calculation via the API.

Also, I cannot find a way of fully create the Charts via the API (I have to open the URL and the select new or add to existing). This prevents us from automatically adding it to a Canvas (Canvas can be fully created via the API)