There is one route “near” Joensuu in Koli: http://hiking.lonvia.de/relation/1708065 . I did create that last summer when I made nano summer trip to Koli. You can add there english description: “Easy walk route in Koli. Route theme is “kaski” - area cleared and burnt-over for cultivation.”
There is at the moment so much snow that main route mapping is made at the moment for cross country skiing. I have made just few walking routes to OSM - the main reason for low motivation is that there is no local service which utilize walking routes in Finland.