I can help you there!
You can make redirect backlinks from google domains using google URL shortener tools. But, this tools has been moved permanently to google firebase. You can use firebase to generate URL shortener as well.
But please keep in mind that DA, PA & spam score properties were discovered by Moz. It has been a lot time since Google's John Muller has officially confirmed that they Google do not use such properties for in its algorithm for ranking factors of a web pages.
Though, if you want to make your domain authority score higher, you should go for this techniques, it would help you.
Thanks