dynamically add folder to ignore when using npm publish

I have a static .npmignore file with

foo
bar
baz

in it. When I publish to NPM, the contents in those 3 dirs will be ignored.

My question is, is there a way to dynamically add a folder to ignore when using npm publish at the command line?

Something like:

npm publish --ignore=.r2g

here we can ignore a folder called .r2g

Here are the npm-publish docs

from dynamically add folder to ignore when using npm publish