Can't install it on macos

[microSoftware]

I installed ArrayFire on macos using the pkg. And it seems to work because the files are at /opt/arrayfire
Now my problem is "linking" it to nodejs.
When i run : npm config set cmake_af_path "/opt/arrayfire/lib"

I get an error:

npm ERR! `cmake_af_path` is not a valid npm option
npm ERR! A complete log of this run can be found in: /Users/x/.npm/_logs/2024-01-15T14_17_49_992Z-debug-0.log

Anyone know why i have this error ? i follow what the readme said