Hi Frank, You can achieve by writing the custom dita-ot plugin using XSLT transformation or Java based depending upon your comfort level.Before this custom step, use the DITA Normalisation step in order to resolve all the references (keys, conkeyrefs etc.) first and then convert a ditamap to JSON Re...

For the Node version you have installed 16.17.0 the compatible npm version should be 8.15.0.   Either you downgrade the node version matching to your existing npm or change the npm as mentioned above.   Thanks, Vijendra