nameserver tls upstream

I wonder if it is possible to use or implement DNS-over-TLS upstream nameservers?
Right now I'm a bit experimenting with grimd and coredns which is able to use DNS-over-HTTPS and DNS-over-TLS.
I want to use grimd as the 'upstream' server for coredns and grimd to upstream it's request via DNS-over-TLS to another public server.