Allow Let's Encrypt for 3rd level domains managed by Digital Ocean. Let's say I have example.com which is managed by Cloudflare and I create cdn.example.com and delegate it to DigitalOcean NS servers. This zone becomes manageable via DO control panel, but when I adding custom subdomain for Spaces bucket - I can't select cdn.example.com in "Use Let's Encrypt" tab. It is a bit confusing where to get SSL cert for custom subdomain if domain managed by Cloudflare especially with free account. It would be awesome to have Let's Encrypt support in this case.