Hello,
We do not currently support DNS-over-TLS in home based accounts, and there are no known plans in the immediate future to do so.
You need a local DNS server, and most home users do not have that. Our Enterprise (Umbrella) users would have a local DNS server and can use DNS over TLS.
---
For information on using DNS over HTTPS, please see
https://support.opendns.com/hc/en-us/articles/360038086532-Using-DNS-over-HTTPS-DoH-with-OpenDNS