It is documented on the Hearts of Iron 4 wiki. This converter is still under development. They also work with the official Crusader Kings II to Europa Universalis 4 converter, the unofficial Crusader Kings 2 to Europa Universalis 4 converter, and the Hearts of Iron 4 to Stellaris converter. Using these tools, a game can be played from Europa Universalis 4, to Victoria 2, to Hearts of Iron 4. These tools allow games from various Paradox Interactive games to be continued in other Paradox Interactive games.
