How to add devices that integrate with Google Home, but not HA?

Does anyone know? I connected Google Assistant and there’s a button called Sync Devices, but it does no such thing.

I’m hoping to add a device that’s in Google Home to HA. HA doesn’t support the device natively.

Is this forum dead? I never get responses. Am I posting incorrectly?

Yes this should be possible. Are you using ha cloud?

No, I’m using a VM. I’m happy to change anything to make this possible.

Again vm… Well I integrated two Bluetooth devices although I don’t have Bluetooth dongle. I done it with tuya gateway. I integrated gateway with ha, added devices on the gateway over phone sync it with alexa and finally enabled devices in alexa settings in ha. But I’m using cloud.

I don’t have a gate way. I have a bt dongle but maybe all I need is a gateway. I have a plant sensor BLE device but it is only updates every few hours or not at all.