How can I enable deployment of individual Lambda functions using Terraform?

I'm working on automating deployment of Lambda functions using Terraform. The goal is to be able to deploy either a single Lambda function or all of the functions in the repo. I'm able to deploy a number of functions from a structure that looks like:

├── README.md
├── js
│   ├── README.md
│   ├── jsFunction1/
│   │   └── main.tf
│   └── jsFunction2/
│       └── main.tf
├── py
│   ├── README.md
│   ├── pyFunction1/
│   │   └── main.tf
│   └── pyFunction2/
│       └── main.tf
└── terraform
    ├── README.md
    ├── common/
    ├── global/
    ├── main.tf
    ├── modules/
    ├── prod/
    └── stage/

The goal is to be able to deploy js/jsFunction1 independently (without building packages for any other functions) while also having terraform/main.tf able to deploy all the lambda functions in the repository (after they've been built). This is so a developer can update the stage deployment with changes to an individual function without concern that they might have an improper version of a function that the developer isn't working on.

What I was hoping to do is create a back-end for each Lambda function so that the developer can use terraform apply from within the source folder. I don't see how to import the state of the Lambda functions that were deployed from the terraform/ module. Can you tell me if importing the state of the resources is a reasonable approach or recommend a better way to achieve the ability to deploy one of many Lambda functions?

Here is the main.tf from js/jsFunction1

module "jsFunction1" {
  source                        = "../../terraform/modules/lambda"
  source_path                   = "${path.module}/dist"
  lambda_function_name          = "jsFunction1"
  lambda_handler                = "lambdaAdapter.handler"
}

There is a similar main.tf in each of the folders under js and py. This is main.tf from the terraform folder

module "jsFunction1" {
    source = "./../js/jsFunction1"
}

module "jsFunction2" {
    source = "./../js/jsFunction2"
}

module "pyFunction1" {
    source = "./../py/pyFunction1"
}

module "pyFunction2" {
    source = "./../py/pyFunction2"
}