Hello,
Thanks for getting in touch with us.
We do not have a specific timeline for the link builder yet but you can keep an eye at our change-log to get update when it is added: https://rankmath.com/changelog/
At the moment we do have a link suggestion option that sort of gets the job done. You can mark any post that you want to build links to, as a Pillar Post in the SEO meta box:
https://i.rankmath.com/23N3Qz
After that, when writing a new post, it will show your Pillar post from the same category you are using for the current post.
https://i.rankmath.com/BucJQE
This is used to build internal links to your most important content.
Hope that helps and please do not hesitate to let us know if you need our assistance with anything else.
