Yes, you just need to add Chrome autocomplete tags.
For example, if you want to autofill the email in the Opt-in form, you should add the tags name="email" and autocomplete="email" in the respective Newsletter sign up modal template under Manage → Templates:
<input class="pn-boilerplate__input pn-boilerplate__input--email"
newsletter-signup-input
id="pn-email"
name="email"
type="email"
placeholder="Your e-mail address" autocomplete="email">