Adding nodes to node-red on homeassistant?

Hi,
can someone explain to me, how I can add custom nodes to node-red on homeassistant?

I would like to use node-red-light-contrib as pointed out here and its supposed to be installed via
npm install node-red-contrib-light

How can I install custom node-red nodes on homeassistant?

Cheers

Just like all other Node Red installs by GUI:
NodeRed Menu (top right)–>Manage Pallete

BTW, welcome to the forum!