• <ip-address> should be your ip address and is exclusive of http protocol (http:// or https://).

settings.py [in dev mode.]

....
DEBUG = True
ALLOWED_HOSTS = ['<ip-address>']
....

• runserver django server with ./manage.py runserver <ip-address>:8000
• edit your webpack.config.js file

webpack.config.js [in dev mode.]

....
host: '<ip-address>',
disableHostCheck: true,
port: 9000
....

• edit your src/config.ts file

src/config.ts [in dev mode.]

....
export const API_URI = "http://<ip-address>/graphql/";
....

• runserver dashboard server as usual.
• also you might need to allow external request with ufw
• sudo ufw allow <port-number> in this case 9000.

Reference

• #206
• SO #1
• SO #2