Reminders’ “Remind me about this” works for lots of things that Apple says nothing about. In the Out of the Water MPU episode, David says there is no way to link to a multi-location Maps route. That’s not true, but the solution is limited to the Reminders app.
If you make a multi-location route in Maps, then ask Siri to “Remind me about this”, the maps deeplink that gets created in reminder links to the multi-location route that you made there. The reminder will also create a URL for the URL field of the reminder, but this URL is more or less useless. Only the deep link will work.