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Description
Since I'm currently playing around quite a lot with tasks, I often get to a point where I feel like there would be, or know that there is, a command variable for what I want to do.
However, most of the times command variables are not well documented or hidden.
The Variables Reference briefly mentions that they exist and that extensions may bring their own, but most often they are not well documented.
Hence I propose to document the command variables in the features tab of the extension (maybe alongside normal commands).
Default command variables, if there are any, should probably be documented on the aforementioned Variable Reference web page.