Popup comments from another variable to another variable?

If it even works you could try:

#define SOMEMACROCOMMENT "This is a tooltip"

UPROPERTY(meta = (ToolTip = SOMEMACROCOMMENT))
  float MyProperty = 1.f;

But I have never been in a situation I’d need a reusable comment. That might point at a bad code style. Also structs should just be used as data container for “any” purpose, as generic as the code allows. So it’s hard to add a single comment / tooltip to a struct.

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