Good Backlinks pointing to a subdomain, help the root domain?

Hello. I have got a website on mydomain.com and the blog on mydomainblog.com. I start telling for tech reasons I can’t host it on a subfolder of the root domain, but I can host it on a subdomain like blog.mydomain.com

What I was wondering is if backlinks pointing to the subdomain will help ranking the root domain too.

In that case I could consider to migrate the blog from mydomainblog.com to blog.mydomain.com

So basically my question is: backlinks to blog.mydomain.com will help ranking of mydomain.com

I am not interested in the reverse (root domain helping the sub domain).

I asked it because I know google considers a subdomain as a completely different domain

Thank you