how to load files in TLS PASS Through in Burp Suite?

I tried to load .txt files in TLS PASS Through but it is not accepting the file type. I tried with (.txt) and (.csv) . The reason behind this is when I open a new project in Burp Suite all time it needs to add manually hosts. So how can I add a list of hosts in a single click?
http://dlvr.it/Rz6HZg