I noticed that in the Waze Editor, under Trips and Segment Lengths, there is a number where the sign for a decimal is a .
For example: At 175 kilometers and 300 meters it says: 175.300 km
In the Netherlands, for example, we use different signs to indicate decimals.
At 1000 meters we do: 1.000 meters
At 25 kilometers and 200 meters we do: 25,200 km (or 25.200 meters).

For example, you see 844 meters for the lengths of segments. If you then click on a segment, it suddenly says 1.340 km. For us in the Netherlands, that is 1340 km. That should be 1,340 km.

If it is not possible per language, then adding this option on the Settings page in the Editor is also good. That could be a good fit under Units where you can also choose between Imperial and Metric.