The Default timeout value is 180. Setting it to 40 isn't required.
Depending on what you want to do with the output data, converting it to json is often unnecessary.
Quotation marks are only needed when a colon is in the expression.
Specifying France isn't required as the `around` statement limits the search area.
As there's only one line of code the containing brackets aren't required
nwr[shop=supermarket](around:2000,48.8534,2.3488);
out center;
There's quire a few areas with Paris as it's name. Best to specify a single one.
I used this one https://www.openstreetmap.org/relation/7444, If you wish to use another relation, add its id to 3600000000 to get the area id.
If you're only using using a single area once, then there's no need to store it in a variable (RESULTS).
area(id:3600007444);
nwr[shop=supermarket](area);
out center;
rel(id:7444);
out geom;geom;
I think relation 2202162 is the incorrect one to use for mainland France:
https://overpass-turbo.eu/s/LDR