Via Claudia Augusta is an old roman route from Donauwörth, Germany down to Venice, Italy. It has then been restored and become an international cycling and hiking trail.
From what I’ve seen, OSM has the cycle relation mapped: Relation: Via Claudia Augusta (3879552) | OpenStreetMap, but lacks many parts of the hiking route. There is just a local slice in Trentino Alto Adige, Italy: https://www.openstreetmap.org/relation/3312655.
At least around my area, the hiking variant is signposted and well known, so it would be useful to have it in OSM. Is anyone willing to map the remaining parts? Are there open sources to use?