Training Peaks power range gets averaged

If I send a TP workout to Zwift, with say, a power range for an effort of 100w-500w (as a percentage of FTP), it’s displayed on Zwift as the average (300w) and ERG kicks in to keep it at that. Is there are way to stop any resistance being added if you are within the TP range?

I do it by using the +/- adjustments on Zwift to change the percentage of the prescribed wattage. At least on AppleTv, the options appear on the pop-up menu. I think you can also do this from Zwift companion. It isn’t ideal because you need to make the changes as you’re riding, but it works.