There’s a Magento 2 image on AWS Lightsail but I would not recommend it. As of today it’s on v2.2.5 and uses a Bitnami installer. I wasted a lot of time trying to get it to run properly. I had problems with the default SWAP configuration, PHP version issues and installing any sort of extension or update (some related to the PHP version). I also found it harder to resolve issues because some aspects of Bitnami installs can be unique to Bitnami application images.
It’s not what you are looking for but I would highly recommend following Craig’s excellent Magento 2.3 installation guide. Take your time with it and go step by step - print out the blog version and tick off the steps as you go if you have to. You’ll end up with a much more stable install. I’ve also found that in-life configuration and maintenance benefits from the experience gained during a manual installation.