Is possible to use "spec" header as template for reusability?

Hello,
I want to reuse the same “spec” header configuration between two gitlab-ci.yml files but only write it once for not having duplicate configuration

Currently i can only make it work with this config:
Inside a common-cicd repo:
02.test.gitlab-ci.yml

spec:
  inputs:
    how_to_run_test:
      default: ''
      options:
        - ''
        - pythontag
        - docker
---
test:
  stage: tests
  image: python:3.8.1-slim-buster
  before_script:
    - echo $[[ inputs.how_to_run_test ]]

.common-dev.gitlab-ci.yml

spec:
  inputs:
    how_to_run_test:
      default: ''
      options:
        - ''
        - pythontag
        - docker
---
stages:
  - analysis
  - tests
  - build

include:
  - local: extensions/01.analysis.gitlab-ci.yml
  - local: extensions/02.test.gitlab-ci.yml
      inputs:
      how_to_run_test: $[[ inputs.how_to_run_test ]]
  - local: extensions/03.build.gitlab-ci.yml

And call to .common-dev.gitlab-ci.yml from another file inside my code repo
.gitlab-ci.yml

include:
  - project: group/team/common-cicd
    ref: dev
    file: .common-dev.gitlab-ci.yml
    inputs:
      how_to_run_test: pythontag

I want to avoid having the spec also duplicated on .common-dev.gitlab-ci.yml
Is there any way with templates|includes|extends to do so?

Even if i am already “including” the 02 file, if i delete the “spec” from .common-dev.gitlab-ci.yml i get error:
Unable to create pipeline
.common-dev.gitlab-ci.yml: Given inputs not defined in the spec section of the included configuration file

Thanks!