It's a bit of a Christmas present... but why?
Because it takes a bit of messing around to plot this as a route - because it's a racetrack and thus, it's not a road you can just go plot a route around on sites like cycle.travel, in fact the road doesn't even exist on there as a place you can put a route. It's there but there's no way to plot a route along it. Bicycles aren't allowed on it and it's just not a road, but it certainly is hilly if you pick the correct section to cycle along.
This starts off with a hilly part and flattens out, but has other hills thrown in after that. The start elevates 900ft in 3 miles. I'll be riding this on my indoor trainer on Christmas day in the evening, to try to burn off some calories from my Christmas dinner, at least that's the plan. Those goose fat roast potatoes are the biggest offender.
Here's the elevation profile:

Here's the GPX file, it's about 8 miles, which isn't far, but this is not an easy ride. Based on my last (and only) ride along here I burned 603 calories, so it's going to be about the same for anyone else doing it.

https://pastebin.com/raw/FSdgcCZJ
Just copy all of the the above text from the link and paste into a Notepad txt file, then rename it as a ".gpx" file and put it in your Garmin "Newfiles" folder. I don't know how that might work on a Wahoo but if you're into this you'll work it out... and Merry Christmas.