This package bundles nodejs and a humongous number of modules. However, the ebuild states: LICENSE="MIT" which is clearly not enough to cover all the included data. Please update the LICENSE field to include licenses for *all* bits of installed data.
Thanks, create PR at least for versions 5.2.2 and 5.3.2 that have the NOTICE.txt listing the licenses: https://github.com/gentoo/gentoo/pull/4602