Chronos setting environment variable leads to error

Question

I tried this both on the chronos config and in my job definition:

    "environmentVariables": [
        {
            "name": "DOCKER_API_VERSION",
            "value": "$(docker version --format '{{.Server.Version}}')"
        }
    ],

It always fails with:

docker: Error response from daemon: 404 page not found.
See 'docker run --help'.

The reason I'm trying to set that variable is because I'm running docker in docker and the client docker API sometimes has a different version than the server docker version and it has to be started with the DOCKER_API_VERSION env set in order to work.

I'm suspecting it's because of the computed value being set instead of a string value.

In the logs I can see it runs as supposed and I don't know why it crashes to be honest:

docker run ... -e DOCKER_API_VERSION=$(docker version --format '{{.Server.Version}}') ...