Yeah, it’s straightforward - we can use HA’s built in Rest API to get them talking to each other.
Here’s the HA link for how it’s done:
And some examples of how to do it, in these cases it uses a Pi with Hassbian to do Bluetooth scanning, and the main Pi HA install reads from that to bring it all together onto to the one HA page.
I run two Pi Zero doing extra little tasks for me and bring them together on my main Pi 3. Plus it means I can extend my Bluetooth scanning out to the range of my wifi 
It’s not an extra hassle, the sensor entries are just a tiny bit longer.