Variable substitution in quadlet files

[apparle]

Is there a way to do some form of variable substitution of in the quadlet .container/.network/.volume files for a single service?
I want to modify the Image= attribute in multiple .container to specify the image corresponding to particular version and keep it consistent across multiple containers of the same service. Note, I don't think the EnvironmentFile tag is useful for me because I don't want to pass variables into the container but just the quadlet / service files.

What I'm trying to achieve:
I don't want to just use :latest tag and auto-update, but instead explicitly select specific versions. And then I want to use an external script that'll download the recommended docker-compose.yml, compare contents, look for specific terms in release notes for any breaking changes etc. and then consistently update image tags for multiple containers (of the same service) consistently. So I need the definition to reside outside in a standalone file somewhere that I can manipulate with a periodically run script.

[Luap99]

You should set EnvironmentFile= under the [Service] section to only set vars for the unit, i.e.
#25053 (comment)