WTH Markdown is the only dashboard card that supports template

Month of "What the heck?!"
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Hello,

Why do we need to create sensors that fill up the database only to display calculated values in the UI ?
Simple exemple: I want to display absolute humidity. I have sensors for relative humidity and temp. To get what I want, I just need to do a few maths.
It would be realy usefull if cards could accept a template.
This feature could be supported only in yaml, no problem, if you can write templates, you can write yaml.
When template is specified, default action on card becomes none.

Thanks for reading

PS1: this is a repost. I have already posted this in the wrong category. I asked deletion of original post.
PS2:vingerha suggested to use this plugin GitHub - iantrich/config-template-card: 📝 Templatable Lovelace Configurations. It’s a good catch, but something built-in would be better.

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Don’t forget to vote for your own WTH.

I am personally using the Mushroom template card from the mushroom card collection for this kind of usage. But it is not core card and does not remove the validity of this demand.