Document External Properties in SQLite

The document https://helpcenter.canarylabs.com/t/m1y8gf3/how-to-configure-external-property-storage-for-populating-metadata-in-virtual-views-version-24 indicates that you can store external properties in SQLite. But doesn't say how to implement it. This is a very enticing idea for me for things like multi-level setpoints and other attributes that don't come from the Collector/Logger. If you could document this, it would be much appreciated.