It’s not exactly what you’re after, but this might be a place to start: https://trailrouter.com/ https://trailrouter.com/ How it works: https://trailrouter.com

It’s not exactly what you’re after, but this might be a place to start: https://trailrouter.com/ https://trailrouter.com/ How it works: https://trailrouter.com/blog/how-trail-router-works/ https://trailrouter.com/blog/how-trail-router-works/ You provide a start and end point and desired distance. It generates one-way or looped walking/running-oriented routes. I’m not the creator, I just use it occasionally.