Using private NPM packages in with cf-pages

I'm working on a cf-pages that uses private npm packages, from it's own registry.
To have it working locally for me, by having added a personal access token from github as
NPM_AUTH_TOKEN
in my
.bashrc
.
And the registry is set in
.npmrc
in the repo, so that should be fine.

But I don't know where to add the
NPM_AUTH_TOKEN
for the cf-pages to install and build?
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