Hi creativeworker,
Paraview has the "ParaView Data" (pvd) File Format which is essentially a collection of vtk data files along with the time steps, see here:
www.paraview.org/Wiki/ParaView/Data_formats#PVD_File_Format
Haven't tried this in years, but in principle that should allow you to wrap the pvd around a collection of vtk files and time stamps. You would need to write this file yourself a.t.m., it's not featured in NGSolve.
Best,
Christoph