On his GitHub it says it's on his to-do list But moving the files isn't really that hard. Just copy over the qml files to /usr/share/maliit/com/jolla/plugins and the files from layouts folder to the layouts folder in /usr/share/maliit/com/jolla/plugins
You can do that either by using the terminal or File Browser from Jolla Store. Then, restart your phone or the maliit service (as described in the OP of this thread) and activate the keyboard in Text Input in System Settings