Avoid Replacing DHCP-discovered DNS Resolvers?

I am on CentOS 7.4 attempting to configure dnsmasq for DNS caching and per-zone DNS servers for running Consul. Essentially, the dnsmasq configuration boils down to this:

# filter everything with consul in the name and send to local consul resolver
server=/consul/127.0.0.1#8600

The problem I'm having is getting the local resolver into /etc/resolv.conf without replacing any other resolvers in the file.

I used to be able to do this using dhclient configuration like so:

prepend domain-name-servers 127.0.0.1;

Since everything is NetworkManager now, I have discovered that the way to use dnsmasq is to add the following line to the [main] section of /etc/NetworkManager/NetworkManager.conf:

dns=dnsmasq

Before restarting NetworkManager, I see that my /etc/resolv.conf contains the network DNS server received by DCHP:

# Generated by NetworkManager
search nowhere
nameserver 10.0.2.3
options single-request-reopen

Upon restarting NetworkManager with the above configuration change, it supersedes my network DNS server with 127.0.0.1:

# Generated by NetworkManager
search nowhere
nameserver 127.0.0.1
options single-request-reopen

Since dnsmasq uses the /etc/resolv.conf to detect local resolvers, I'd like to leave the resolver(s) in /etc/resolv.conf so that dnsmasq can discover them.

Is there a way to achieve the previous functionality of having NetworkManager just prepend the local resolver instead?