Unset HTTP proxy option for svn using --config-option

If a have a ~/.subversion/servers file that looks like this:

[groups]
corporate-repo=*.repo.example.com

[corporate-repo]
http-proxy-host= www-proxy.example.com
http-proxy-port= 80
http-proxy-compression= no
ssl-client-cert-file=/path/to/cert.pfx

How can I use the --config-option switch to svn to unset the HTTP proxy option when connecting to myrepo.repo.example.com on a different network where the configured proxy server is not available. This is on macOS, in case that's relevant.