Rear right wheel
The black liquid is traces of WD-40
Front right wheel
This occured after driving at 30 km/h and bumping in a part of the sidewalk that was going into the street.
Does this damage need me any repair before I can put new tires on the rear wheel ?
Should I repair / change the front wheel ? (still up and running)
CONCLUSION :
1 found a decent unused alloy wheel + tyre (new) for 80$, and replaced the rear wheel, that would not fill with one of those "tire repair kit" pressurized foam bottles.
the front wheel's damage has not changed the shape of the part that is in responsible of the sealing of the tubeless tyre, so no change needed for the moment ! :-)