after importing from TP edit the workout in Connect and add a note for each step with the info you want and it should show that info at the start of the interval.
There is actually a way to do this, I had the same issue
I made the changes on training peaks, not within garmin connect. If you open the planned workout in training peaks, and click on the blue bars (the timeline that shows power zones) it will then open a screen to edit them.
Under the section "workout details editor" each section will have a title (e.g. warm up 1, warm up 2, Hard etc). That title is what your garmin watch will show you while running for that section. So all you need to do is just add to it or change it, so for example, you could change "warm up 1" to "warm up 1 - zone 1 - 200-300w" or whatever else will jog your memory. After that just save it and sync your watch within garmin connect.
Its not super simple, but for your more complicated speed workouts, makes it a lot easier to remember what you are supposed to do in that section.
Hope this helps!
This worked like a charm, thanks a bunch. I was wondering how to go bout it and stumbled on this thread