Boundaries are unfortunately a bit more complicated than streets. I do some mapping in the northwest Twin Cities though and can help get those added into OSM. There’s not a lot of township boundaries drawn in MN yet, currently it looks like only in Isanti/Chisago County. Though it is documented in the wiki, so don’t see any reason why we shouldn’t add them.
It doesn’t look like any admin_level=7 boundaries in MN are being pulled into CityStrides though, so @JamesChevalier will need to add that if I’m correct. Apparently townships never overlap cities in MN, so shouldn’t cause any nesting (United States admin level - OpenStreetMap Wiki).