I have the ratgdo on order as well. It uses mqtt - it should be capable of integrating to Smartthings, allowing control of the garage door again.
It is highly unlikely - MYQ has effectively sealed off their API. They are using a cloudflare smart AI bot detection program to block any unauthorized acess to their API that is not through their “official” app or “official” partners. From a developer standpoint, it is difficult to beat, and even if one does, it likely would only work temporarily until the skynet like AI adapts and blocks it again. You can read more about it here - Cloudflare Bot Management & Protection
With MYQ/Chamberlain doing this to basically force people into their subscription services or see their ads, I would recommend to anyone to avoid this product. A smartthings direct partner integration would be the ideal solution, but even if that happens - expect a subscription fee. The tesla subscription fee for garage door control is running $45 a year.