[OSM-newbies] How to map a place that allows to cross a waterway=stream

[Stefan Breunig]

The problem is:
There's a small waterway=stream and there are trails from both sides,
but there is no bridge or ford or anything else that would ease
crossing the stream. It's just a place without bushes and trees and
the stream is relatively small so crossing is easier. How should I tag
this feature so it allows routing software to understand? It's easily
understandable for humans that this place is probably suitable for
crossing since there are trails from both sides, but that there's no
special "thing" that allows that. However, navigation software of
course won't route there.
Any ideas?

Thanks!
xeen