(Review requested)

If you wanted to add the log itself, you could add a node (point) where it is on the track with the tags barrier=log + check_date=2025-04-30 (or whatever date you visited). The links below might be useful.

https://wiki.openstreetmap.org/wiki/Tag:barrier%3Dlog
https://wiki.openstreetmap.org/wiki/Key:check_date
https://wiki.openstreetmap.org/wiki/Key:obstacle#Fallen_tree