With DoH, query integrity and confidentiality are already guaranteed. The only additional ask for something like ODoH is to hide the client IP address from the DNS. For which, any proxy will do. Why bother to go through all the complexities to create ODoH?
If you want to see some details, I compared ODoH with a plain HTTP proxy here: https://www.pcwrt.com/2020/12/oblivious-dns-over-https-vs-doh-through-http-proxy/