Vftable data type definition from selection Ghidra extension.
$ export GHIDRA_INSTALL_DIR=<ghidra-dir>
$ gradle buildExtension> gradle -PGHIDRA_INSTALL_DIR="<ghidra-dir" buildExtension
Install extension : File > Install Extensions > + > ./dist/VFTableSel.zip. Restart Ghidra.
Enable plugin : From Code browser tool : File > Configure > Miscellaneous > check VFSelPlugin.
In data view, select virtual table range, right-click > Data > Create vftable...