What I was looking is showing field value in a tooltip (it is subclass of popup windows). To be clear on what I am talking (a tooltip) see below:
A ToolTip is a small pop-up window that appears when a user pauses the mouse pointer over an element; the Popup control provides a way to display content in a separate window that floats over the current application window relative to a designated element or screen coordinate.
Just to clear this: I know displaying extra information in tabular format, or show side by side using hidden elements or similar! They are not what I talked about nor what I am looking for! I said using tooltip to show field value!
As per pervious discussions (several times in forum or GitHub) Tiddlywiki cannot handle tooltips/popups as it should! This is a wider problem I was encountered first in Refnotes plugin! So, for now it is better to not go for tooltips/popups window or whatever it is called!
Thank you all!