How to add Nofollow to the External URL but Not to Internal URL?

Site URL: https://www.philippinestravelguides.com/

Hi

I have used one of the code which explains how to make nofollow link on the website https://www.philippinestravelguides.com/ (Pass- HOPPFCL) now all URL's including my website Internal URL too has become nofollow.

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.0/jquery.min.js"></script>
<script>
$(document).ready(function() {
	$("a").attr('rel','nofollow');
});
</script>

What i noticed that squarespace use "Relative Link" instead of "Absolute Link" which the code cant identify internal vs external link so treating all link as external and marking them as nofollow.

So, I want to know how i can make my Internal Url's Dofollow. Need help on this..

Thanks

Add this new code

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<script>
$(document).ready(function() { 
$('a').attr('rel', function() {
  if(this.host == location.host) return '_dofollow'
  else return 'nofollow'
});
});
</script>

Thank you @tuanphanonce again for this code. It did solve my issues. Thank you so much!