Since there is no plugin for file picker which will support all type of files like doc, PDFs, xls, txt, zip,…etc,
As a temporary solution I have done workaround on Nativescript-image picker plugin.
By using this awesome plugin, we can get the path of file(whatever file type) then using wonderful Nativescript-Filesystem,
We can process the picked file further.
Thanks @multishiv19 for your suggestion on this on older time.
Hope this may help someone!