@Anonymous wrote:
The feature is there in 2019, but so far the description how to access it has been terrible:
- Select "Measure"
- Hover over one section of the sketch until the alternative option dropdown appears
- Select "Curve Loop"

To the best of my knowledge there is no way to export this as a live parameter.
@Anonymous Andy, you can edit the sketch and create dimensions (arc lengths for arcs) for each line or arc (even if driven dimensions) and then create a "live" user parameter that adds them together.
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