How to add an additional package repository?

I would like to add the GNU-devel ELPA package repository and install a development version of the eglot package. What I would probably do in vanilla Emacs is:

(add-to-list 'package-archives '("gnu-devel" . "") t)

and then in Doom I’d like to install the package from that repository with:

(package! eglot)

I’m not sure on how to add a package repository and then pick the package from there.

Any hint? Thanks!

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