nchan subscribe to additional channels without reconnecting

Clash Royale CLAN TAG#URR8PPP
nchan subscribe to additional channels without reconnecting
I'm using nchan channel multiplexing with config bellow
nchan
location ~ /sub/(.*)$
nchan_subscriber;
nchan_channel_id "$1";
nchan_channel_id_split_delimiter ",";
I also use this URL to subscribe channel1 and channel2 using javascript web socket.
channel1
channel2
ws://localhost/sub/channel1,channel2
is it possible to subscribe to additional channels without closing and reconnecting with a no-loss guarantee?
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