help needed for a nodejs + npm port: mongosh

Hi,

I'm trying to port MongoDB Shell to FreeBSD.
See the attached Makefile.

The build stage starts to fetch some npm packages which is not possible in poudriere.
How can I install NPM packages upfront?

The Mk/Uses/nodejs.mk file does not mention this and the porters handbook is also pretty limited on nodejs/npm information.

A pointer to some existing port as an example would also help.

Regards,
Ronald.