Why it's not possible to use $VARIABLE inside url in include pipeline

Thanks you @balonik for your response,

However, my URL is not Gitlab server Url ( CI_SERVER_URL ).
It would be too easy

Do you know why this has not been implemented? Any particular technical reason?
I have seen on the internet several people wanting this.

• The include keyword does not parse CI variables (#52972) · Issues · GitLab.org / GitLab FOSS · GitLab
• Ability to expand variables in .gitlab-ci.yml "include" directive
• Can I use VARIABLE in INCLUDE statement block in gitlab-ci.yml?