You don’t say how far away the garage is from the hub, or if there is anything in between so it’s hard to make any recommendations, but the fact that you have posted on here would indicate that you have tried it and the WiFi signal in the garage is not adequate.
The best possible option would be to run a cat 6 or 6e cable from the hub to the garage and fit a (fairly cheap) WiFi access point in it. Is this remotely feasible? Any competent electrician should be able to do this for you, but it would involve holes being drilled into walls etc.
The option of Powerline adapters has been mentioned, do you even have a mains power socket in the garage? If not, then this is a non-starter, and even if you do, if it is on a different circuit (as mentioned by jpeg1), then it can make it a bit problematic.
Realistically, I think you may need to run a cable.