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The imported targets for each VTK module are missing information like include directories, compile definitions, etc. For example, currently for vtkCommonMath there is the following in VTKTargets*.cmake:

# Create imported target vtkCommonMath
add_library(vtkCommonMath SHARED IMPORTED)

set_target_properties(vtkCommonMath PROPERTIES
  INTERFACE_COMPILE_FEATURES "cxx_nullptr"
  INTERFACE_LINK_LIBRARIES "vtkCommonCore"
)

# Import target "vtkCommonMath" for configuration "RelWithDebInfo"
set_property(TARGET vtkCommonMath APPEND PROPERTY IMPORTED_CONFIGURATIONS RELWITHDEBINFO)
set_target_properties(vtkCommonMath PROPERTIES
  IMPORTED_IMPLIB_RELWITHDEBINFO "${_IMPORT_PREFIX}/lib/vtkCommonMath-8.0.lib"
  IMPORTED_LOCATION_RELWITHDEBINFO "${_IMPORT_PREFIX}/bin/vtkCommonMath-8.0.dll"
  )

list(APPEND _IMPORT_CHECK_TARGETS vtkCommonMath )
list(APPEND _IMPORT_CHECK_FILES_FOR_vtkCommonMath "${_IMPORT_PREFIX}/lib/vtkCommonMath-8.0.lib" "${_IMPORT_PREFIX}/bin/vtkCommonMath-8.0.dll" )

What's missing is something like:

set_target_properties(vtkCommonMath PROPERTIES
  INTERFACE_INCLUDE_DIRECTORIES "${vtkCommonMath_INCLUDE_DIRS}"
)
set_target_properties(vtkCommonMath PROPERTIES
  INTERFACE_COMPILE_DEFINITIONS "${vtkCommonMath_DEFINITIONS}"
)