There’s apparently a custom HACS integration [0], discussed in their forums [1]. Personally I’d get the cheaper Aqara sensors as I have a Zigbee network anyway, so I see no advantage in BLE. Also, the motion sensor (of the tag, not of other people) seems like a really useless feature.
The motion sensor isn't useless, you just lack imagination :)
You can slap one on your mailbox lid for example and have an alert pop up when the counter changes. It has X/Y/Z acceleration sensors too if you want to know the direction of the motion.
[0]: https://github.com/ruuvi-friends/ruuvi-hass.io
[1]: https://f.ruuvi.com/t/ruuvi-sensors-ruuvi-gateway-home-assis...