Board Thread:Technical Updates/@comment-24006128-20200311154142/@comment-9605025-20200325024205

Portable infoboxes are already supported on UCP. What is not yet available is InfoboxBuilder, the graphical interface for creating/editing infobxes. You can try creating portable infoboxes in source mode or (as Tupka217 has been suggesting) you can use InfoboxBuilder on a test wiki that uses the legacy platform and then copy the source code to the UCP wiki.