Hi @stephboi
First, The Knime-Geospatial-Extension is KNIME Team with the Center for Geographic Analysis at Harvard University to develop a geospatial extension for KNIME. Not mine.
Second, Knime node can do your problem. you can see Convert a WKT Polygon string to Geometry - #2 by marvin.kickuth. If it can’t be solved, send the data to me, and I will make a workflow for you.
Third,The Knime-Geospatial-Extension can do this ,but Slightly slow,Because it may be due to the version, it should be OK when the knime is updated to 4.7. you can try it.
Good Luck!