How to access docker secret from orther container

Question

I have a docker compose file for my nodejs application. I need to hide the connection string and take it out from docker secret and assign it to the env variable to initiate the database connection. But the env being assigned seems to be a path rather than the desired secret value. Please guide me. Thank you.

here is my docker-compose.yml

version: "3.1"

services:
  web_server:
    image: "nginxdemos/hello"
    secrets:
      - secret_value
    environment:
      NODE_ENV: production
      SECRET_ENV: /run/secrets/secret_value
    ports:
      - "80:5001"
secrets:
  secret_value:
    external: true

My index.js

router.get('/', function(req, res, next) {
  res.send('Server is running ' + process.env.SECRET_ENV);
});

Commands:

nguyenthanh@MacBook-Pro-cua-Nguyen NextZone % docker secret ls
ID                          NAME                 DRIVER    CREATED       UPDATED
tw9c2q55u511s5xt0n46s9cam   db_host                        2 days ago    2 days ago
plslnygpghdh1jljz8iytzjq4   my_external_secret             2 days ago    2 days ago
z8jalp982098swxy4abycl6so   secret_value                   2 hours ago   2 hours ago
nguyenthanh@MacBook-Pro-cua-Nguyen NextZone % docker stack deploy --compose-file=docker-compose.yml secret_test                           
Creating service secret_test_web_server
nguyenthanh@MacBook-Pro-cua-Nguyen NextZone % docker ps    
CONTAINER ID   IMAGE                     COMMAND                  CREATED          STATUS          PORTS     NAMES
9635bd581a80   nginxdemos/hello:latest   "/docker-entrypoint.…"   11 seconds ago   Up 11 seconds   80/tcp    secret_test_web_server.1.b6wg1s5usb6euaw79unpbh9f7
nguyenthanh@MacBook-Pro-cua-Nguyen NextZone % docker exec 9635bd581a80 cat /run/secrets/secret_value
sec180499
nguyenthanh@MacBook-Pro-cua-Nguyen NextZone % docker exec 9635bd581a80 cat printenv                 
cat: can't open 'printenv': No such file or directory
nguyenthanh@MacBook-Pro-cua-Nguyen NextZone % docker exec 9635bd581a80 printenv    
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
HOSTNAME=9635bd581a80
NODE_ENV=production
SECRET_ENV=/run/secrets/secret_value
NGINX_VERSION=1.21.6
NJS_VERSION=0.7.2
PKG_RELEASE=1
HOME=/root

I'm expecting my env to look like this SECRET_ENV=sec180499