How to use Helm's default persistent-action behavior?

[jclosure]

In helm-map, I have

    (define-key helm-map (kbd "TAB") #'helm-execute-persistent-action)

helm-projectile implements a custom action helm-projectile-file-persistent-action that
defaults to a preview. Can you provide some advice on how to get the default helm-find-files-persistent-action-if behavior in helm-projectile-find-file-dwim? I tried to swap out the peristent-action, but it's not directly compatible. Seems like we'd need to expand the candidate and insert it into
minibuffer. I'm an elisp noob, so hoping you can point me in the right direction. Thanks.