How to obtain docker image tag from file in the repo?

docker
circle.yml

#1

Is there a way to obtain the docker image tag from a file within the repository (for example, from a JSON or .env file), e.g. ${SOME_TAG} in this example:

version: 2

jobs:
  build:
    docker:
      - image: myimge:${SOME_TAG}

#2

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