Gitlab CI : templates / inputs for managing a parallel matrix

GitLab CI/CD
1

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Problem to solve

Use a parallel matrix based on inputs in a CI/CD template (component)

I tried different types values and different “injections” but without success :

# .gitlab/mytemplate.yml
spec:
  inputs:
    archs:
      default: "[amd64,arm64]"
    targets:
      default: "amd64,arm64" # alternate syntax test value
---
# .gitlab/mytemplate.yml
spec:
  inputs:
    archs:
      default: "[amd64,arm64]"
    targets:
      default: "amd64,arm64" # alternate syntax test value
---
job1:
  script:
    - echo "$ARCH"
  parallel:
    matrix:
      - ARCH: $[[ inputs.archs ]]
      # - ARCH: "$[[ inputs.archs ]]"
      # - ARCH: ["$[[ inputs.archs ]]"]
      # - ARCH: [ $[[ inputs.archs ]] ] # cant be parsed

job2:
  script:
    - echo "$TARGET"
  parallel:
    matrix:
      # - TARGET: $[[ inputs.targets ]]
      # - TARGET: "$[[ inputs.targets ]]"
      - TARGET: ["$[[ inputs.targets ]]"]
      # - TARGET: [ $[[ inputs.targets ]] ] # cant be parsed

# .gitlab-ci.yml
include:
  - local: '.gitlab/mytemplate.yml'

As long as inputs do not support the array type, I am not sure it may work.
Any help ?

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