Hi Oliver,
Lumira extension properties documentation is listed here - Visualization Extension Plugin for SAP Web IDE Guide
as you already pointed out, SWOT Analysis from our open source Github gallery has an example implementation. you can find the relevant github extension here - lumira-extension-viz/SWOT_Analysis at d5e8b22829d843b76a794b0ce8b151c16bacb35e · SAP/lumira-extension-viz · GitHub