How to setup apache2.conf within docker nextcloud container

I installed Nextcloud with the official Docker container which includes Apache. I want to permanently access the settings (apache2.conf file).
When opening a shell, I saw that the log files are in /var/log and the configuration files in /etc/apache2.
So I added these two lines in docker-compose.yml:

      - ./ncloud-logs/:/var/log
      - ./ncloud-conf/:/etc/apache2

The first one works without problem: the logs are accessible.
However, the second line causes an error that prevents the container from starting:
apache2: Could not open configuration file /etc/apache2/apache2.conf: No such file or directory

Below, the complete docker-compose.yml file
Thanks for your help

version: "3.8"
services:
  ncloud-db:
    image: mysql
    container_name: ncloud-db
    command: --default-authentication-plugin=mysql_native_password --character-set-server=utf8mb4 --collation-server=utf8mb4_unicode_ci
    restart: unless-stopped
    environment:
      - MYSQL_ROOT_PASSWORD=[password]
      - MYSQL_DATABASE=ncloud
      - MYSQL_USER=[username]
      - MYSQL_PASSWORD=[password]
      - MYSQL_ALLOW_EMPTY_PASSWORD=yes
    volumes:
      - ./dbdata:/var/lib/mysql

  ncloud-app:
    image: nextcloud
    container_name: ncloud-app
    hostname: ncloud-app
    restart: unless-stopped
    environment:
      - MYSQL_HOST=ncloud-db
      - MYSQL_DATABASE=ncloud
      - MYSQL_USER=[username]
      - MYSQL_PASSWORD=[password]
      - NEXTCLOUD_ADMIN_USER=[username]
      - NEXTCLOUD_ADMIN_PASSWORD=[password]
    ports:
      - "8089:80"
    links:
      - ncloud-db
    volumes:
      - ./ncloud-data/:/var/www/html
      - ./ncloud-logs/:/var/log
      #problem!! - ./ncloud-conf/:/etc/apache2

  ncloud-pma:
    image: phpmyadmin
    container_name: ncloud-pma
    environment:
      # https://docs.phpmyadmin.net/en/latest/setup.html#docker-environment-variables
      - PMA_HOST=ncloud-db
      - PMA_PORT=3306
      - PMA_ARBITRARY=1
      - UPLOAD_LIMIT=1024M
    ports:
      - "8083:80"
    links:
      - ncloud-db