For new people like me… this was not intuitive at all and a lot of refreshed, restarts to get it working.
Install the Repo
Restart HA
Force web page refresh (CTRL-F5 for windows users)
Go into Integrations and click to add new
find HA Data and add it
Download it
Restart HA
Took me a few extra steps as the Repo shows it added at first, then after reboot it was gone. Doublecheck that the Repo is there after reboot.
the dev team could definitely make this WAY easier, too many hoops to get HACS installed and then add repos, etc.