How to create reusable templates for dependabot configurations? - dependabot

Question

I have a C# project containing multiple assemblies with some node modules as dev dependencies.
Given this example dependabot.yml configuration file
version: 2
updates:
- package-ecosystem: 'npm'
directory: '/'
schedule:
interval: 'weekly'
labels:
- 'dependencies'
target-branch: 'dev'
commit-message:
prefix: 'deps'
reviewers:
- 'user1'
- 'user2'
- 'user3'
- package-ecosystem: 'nuget'
directory: '/MyCsharpProject/Assembly1'
schedule:
interval: 'weekly'
labels:
- 'dependencies'
target-branch: 'dev'
commit-message:
prefix: 'deps'
reviewers:
- 'user1'
- 'user2'
- 'user3'
both configurations are almost the same. The only things that are different:
the ecosystem
the directory
is there a way I can create some templates? This is a pseudo implementation I'm looking for
version: 2
updates:
- template
name: 'my-template'
schedule:
interval: 'weekly'
labels:
- 'dependencies'
target-branch: 'dev'
commit-message:
prefix: 'deps'
reviewers:
- 'user1'
- 'user2'
- 'user3'
- package-ecosystem: 'npm'
directory: '/'
fill-from: 'my-template'
- package-ecosystem: 'nuget'
directory: '/MyCsharpProject/Assembly1'
fill-from: 'my-template'
Currently my C# project has 8 assemblies and the configuration requires a lot of copy paste. It would be nice to make things reusable.

Answer 1

It does not appear that the YAML Schema of the dependabot configuration file supports either;
- template
name:
or fill-from:
These are the official docs for dependabot configuration and detail the allowed key/value pairs available for configuration.
Sadly it doesn't look like it will let you adhere to the DRY principle. 😕️