Where is it specified that some piece of code need to deployed as Lambda Function using "amplify add function"

Question

I'm going through a codebase but unable to understand how amplify taking local code to lambda function:

I have below file structure:

Here myLambda1, myLambda2 contains code of my-lambda-1 and my-lambda-2 respectively. But I'm unable to figure it out where is it specified that myLambda1 should take code of my-lambda-1