feat: Add support for the dynamic variables

[divyanshub024]

Description

This issue aims to initiate the discussion on adding support for dynamic variables. The goal is to enhance flexibility by allowing runtime evaluation of variables based on context.

[ishanvaghani]

Can you elaborate in details? This will help us understand and think about the solutions.

[aktxyz]

Can you elaborate in details? This will help us understand and think about the solutions.

search on dynamicvariable here ... they did a decent job here
https://pub.dev/packages/json_dynamic_widget#using-variables