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Importing power data form a ride you've done already would work I guess, but you wouldn't get the visual feedback of progress and what's coming up next etc. Seems like a bit of a shonky work-around.
If you want to do virtual ride stuff, doesn't Zwift have a workout builder you could make your plan in? That way you're not paying for a plan you don't use (TR), you get your virtual ride thing and you can make your own structured workout based on the analogue plan you've found.
I tried to get my pre-race warmup onto my Wahoo Elemnt Bolt but came to the conclusion that I'd need a Training Peaks or Today's Plan account to do so. I couldn't find any evidence of a Wahoo workout builder - there was a blog post or something about it but I couldn't find the actual app.