If you use Chemacs, a sample init.el is provided as follows:

;; An example of init.el

(defun add-subdirs-to-load-path (dir)
  "Recursive add directories to `load-path'."
  (let ((default-directory (file-name-as-directory dir)))
    (add-to-list 'load-path dir)
    (normal-top-level-add-subdirs-to-load-path)))
(add-subdirs-to-load-path "~/.emacs.d/")

(require 'eaf)

During EAF installation, you only need to modify the parameter value when calling function add-subdirs-to-load-path, change it into your full path to the EAF installation directory. The sample gives a situation when you install EAF at ~/.emacs.d/.

After EAF installation, let's assume your EAF installation directory is ~/eaf, you only have Emacs configurations at ~/.emacs.d and EAF installed on your computer, and you have installed Chemacs, then the .emacs-profiles.el should look like this:

(("default" . ((user-emacs-directory . "~/.emacs.d")))
 ("EAF" . ((user-emacs-directory . "~/eaf"))))

When you want to use EAF by chemacs, you can excute emacs --with-profile EAF in the terminal.