@daportelli but , you could edit the modulename.js (MMM-pi-hole-stats.js)
and ADD the variable definition
apiToken: "",
and then restart MM and go to config and it will be there
and then you go to MMM-Config folder and run
./create_form_for_module.sh MMM-pi-hole-stats
and it will generate and save the schema with the updated fields
and you can restore the MMM-pi-hole-stats.js
and it will be good from then on
same with the default weather module