nextcloud in docker-compose not reachable - nginx

Question

I am using docker compose on my raspberry pi. In the yaml file I have a nextcloud and nginx (for outside communication). But as my raspberry pi is in my private network, I want to have also a direct connection for my immobile setup.
Something like an ip: 192.168.0.100:1080
What I have tried:
version: '3'
volumes:
nextcloud-data:
nextcloud-db:
npm-data:
npm-ssl:
npm-db:
networks:
frontend:
backend:
services:
nextcloud-app:
image: nextcloud
restart: always
ports:
- "1080:80"
- "1443:443"
volumes:
- nextcloud-data:/var/www/html
environment:
- MYSQL_PASSWORD=replace-with-secure-password
- MYSQL_DATABASE=nextcloud
- MYSQL_USER=nextcloud
- MYSQL_HOST=nextcloud-db
networks:
- frontend
- backend
nextcloud-db:
image: mariadb
restart: always
command: --transaction-isolation=READ-COMMITTED --binlog-format=ROW
volumes:
- nextcloud-db:/var/lib/mysql
environment:
- MYSQL_ROOT_PASSWORD=replace-with-secure-password
- MYSQL_PASSWORD=replace-with-secure-password
- MYSQL_DATABASE=nextcloud
- MYSQL_USER=nextcloud
networks:
- backend
npm-app:
image: jc21/nginx-proxy-manager:latest
restart: always
ports:
- "80:80"
- "81:81"
- "443:443"
environment:
- DB_MYSQL_HOST=npm-db
- DB_MYSQL_PORT=3306
- DB_MYSQL_USER=npm
- DB_MYSQL_PASSWORD=replace-with-secure-password
- DB_MYSQL_NAME=npm
volumes:
- npm-data:/data
- npm-ssl:/etc/letsencrypt
networks:
- frontend
- backend
npm-db:
image: jc21/mariadb-aria:latest
restart: always
environment:
- MYSQL_ROOT_PASSWORD=replace-with-secure-password
- MYSQL_DATABASE=npm
- MYSQL_USER=npm
- MYSQL_PASSWORD=replace-with-secure-password
volumes:
- npm-db:/var/lib/mysql
networks:
- backend
Additional information
The docker is started with docker-compose up -d
Nginx is not configured yet
Nextcloud is not configured yet
But with this approach the address 192.168.0.100:1080 does not resolve. Is this the right way to do it or why is the port 1080 not reachable?