There's a way to pass a variable from userdata to docker-compose to nginx in a EC2 instance

I am trying to mount a nginx server with docker compose in an instance of EC2 I need to pass an environment variable, that varibale is defined in the user data of the instance

I tryed to uploaded it with the environment option of the docker compose but when the nginx is uploaded it creates a static code and can't be replaced making reference with "process.env.KEY", I want to know if there's a way to pass the variable to nginx maybe before the build, or update the static files after they have been created

userdata.sh

#!/bin/bash

echo KEY=keyexpected >> /etc/environment

docker-compose.yml

version: "3.1"
services:
  container1:
                container_name: container1
                image: image1
                restart: always
                network_mode: bridge
                environment:
                        - KEY=${KEY}
                ports:
                - 8080:80
  container2:
                container_name: container2
                image: image2
                restart: always
                network_mode: bridge
                ports:
                - 3000:3000

Javascript file that will be build by ngnix

const path = { key: process.env.KEY };
console.log(path.key)

Dockerfile of Node project

FROM nginx:1.15.2-alpine

RUN rm -rf /usr/share/nginx/html/

COPY nginx/default.conf /etc/nginx/conf.d/

COPY build /usr/share/nginx/html/

EXPOSE 80

ENTRYPOINT nginx -g 'daemon off;'

expected: console.log(path.key) ----> "keyexpected"

actual: process.env.KEY is undefined