Mount file ind folder with docker-compose

Question

On the docker host is a folder for an web side: /var/html

Inside is a config file, named config.yaml => /var/html/config.yaml

It works with

volumes:
- /var/html/:/var/html

The config.yaml is mounted with the folder.

Now, on docker host, I have the file stored in /etc/foo/config.yaml

Is there anyway in docker-compose to do that? That does not work:

volumes:
- /var/html/:/var/html
- /etc/foo/config.yaml:/var/html/config.yaml

Any other idea except mounting to a different volume and copying on startup of container?