overture installed on router as up-stream server , how to config the server line in dnsmasq.conf

[youngfisher]

I successfully configured dnsmasq and overture on router with ipv4, thanks to the author,
After that, I noticed that the network property on Windows system only shows ipv4 DNS server as 192.168.1.1, without ipv6 DNS server at all.
If I want the Windows system display ipv6 DNS server with the existing dnsmasq and overture, how to config the server line?

Currently with ipv4, the server line goes
server=127.0.0.1#5555

I tried to add :::1/128#5555 behind the above line only to find that config file can't recognize this format and report errors.