Image folder for images for node red dashboard

Hello. I am trying to follow this guide about setting up an image folder for node red:
...
// When httpAdminRoot is used to move the UI to a different root path, the
// following property can be used to identify a directory of static content
// that should be served at http://localhost:1880/.
//httpStatic: '/home/nol/node-red-static/',

But all the posts relate to standard node red installations. I can't find how to set this up. I am experimenting with images in a ui_template and don't know/can't find where src="some_path" is on a Pi5
The URL of the image is: http://x.x.x.x:3000/plugins/signalk-node-red/redApi/ui/testimage.jpg
Any help?
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