How can I choose my own Lambda infra backend

Lambda runs your code on a high-availability compute infrastructure and performs all of the administration of the compute resources, including server and operating system maintenance, capacity provisioning and automatic scaling, and logging. With Lambda, all you need to do is supply your code in one of the language runtimes that Lambda supports.

You cannot choose the underlying server as lambda is managed by AWS. You can deploy the code running in lambda via fir instance containers images : https://docs.aws.amazon.com/lambda/latest/dg/images-create.html, but you cannot say:”run the machine where the lambda is running, on ec2/ecs/eks”, as an example