You need to install the Font on the PC where you run C2.
Then import it in the files folder.
Now, you can use it as a normal font.
I have tested it on CocoonJS and it works good.
Be only sure that the file font name, will be the same of the font name you see if you open the font. Otherwise It will could not work.
To be sure it is all ok, when you try the game with CocoonJS, you will look at the fps screen and you will have a message that speak about correct import of custom font (I do not remember the correct message).