Having a quick look, would you consider these types of workouts to be Speed/Power:
https://whatsonzwift.com/workouts/gcn/sprints-sprint/
Then these types to be more capacity?
https://whatsonzwift.com/workouts/gc...ax-vo2-i-ouch/
Even to my untrained eye, I can see the difference there. So when it says to do 1 capacity I'll do one similar to the second. When it says to do Speed and Power I'll focus on the first. If I find a few I'll start off with the ones with the lower stress points or TSS scores towards the start of the 12-week block then slowly ramp it up?