To resurrect this a bit - I have an Eero network and found that I could add its Thread component to Home Assistant.
In HA navigate to Settings > Devices & Services > Thread > Configure
You see your Eero routers and other border routers/networks listed but no preferred network.
Tap the ellipses in the top right and choose “Add dataset from TLV”
Open the Eero app and navigate to Settings > Network > Thread
Tap and hold on the “Active Operational Dataset” and choose Copy
Paste this into HA and it looks to use the Eero network. You can also pick one of the TBRs to use for iOS/Android credentials.
I don’t have any matter or thread devices to play with so no idea if any of it works but maybe someone here can have a go!