hi there, the post below isn’t 100% the answer to your question but it is related.
You don’t have to use Netlify DNS if you don’t want to! it is totally fine to manage your DNS somewhere else and just point it towards Netlify if that is what you prefer.
Yup! Just needs to be configured correctly as described here: Configure external DNS for a custom domain | Netlify Docs , and then applied in our UI. We’ll automatically start trying to get a certificate as soon as you apply the hostname in our settings, so please make sure DNS is setup before you do so (or, remove and re-add the hostname in our UI to retrigger the provisioning if it’s been >3 days between config-set-at-netlify and config-changed-at-DNS-host)