In order to get Via you need to install QMK. There is a post by the mods about installing qmk. Shameless plug: I also put together a keymap for the 65% here.
Currently I don’t have VIA enabled in my setup, but its a pretty simple flag to flip(in config.c probably) once you have qmk installed and working. If you need any help let me know I have a 96% here, but I haven’t had time to work out QMK on it yet.