What kind of functionality are you thinking of:
Channel / More conditions or actions to existing
-add sun elevation and/or Azimuth to weather channel or separate ‘Sun’ channel for these including rising and setting times.
Is the functionality already available at a service like IFTTT, Alexa or Google Home?
Not that I know of.
What functionality would you like to propose:
With sun elevation percentage you could set a condition for a trig when the sun is at a specific high. This changes over the year.
For example to activate the shades or sun screens.