[Tagging] Segregated foot-cycle path with different surfaces

[Volker Schmidt]

How do I correctly tag this way: OSM way 434742113
<https://www.openstreetmap.org/way/434742113>,  Mapillary image
<https://www.mapillary.com/map/im/WA2lBoDF91ISfRY983d4wf>
It's a segregated bidirectional foot-cycleway:
highway=path
bicycle=designated
foot=designated
segregated=yes
onewy=no
Its overall width is
width=4
It's illuminated
lit=yes
Its surface is ok:
smoothness=good
I want to indicate the relative position of foot and cycle lanes:
lanes=2
bicycle:lanes=no|yes
foot:lanes=yes|no
I'm tempted to extend this approach  to the surface and width as well:
surface:lanes=asphalt|fine_gravel
width:lanes=1.5|2.5

Is this tagging correct? Are there (better) alternatives?
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