Hi Sourabh,
Unfortunately features like this are not theme-related would definitely require a plugin without a custom solution.
You could try Googling to find a custom solution online but obviously we cannot guarantee that it won’t cause any issues.
Using a plugin isn’t always a bad idea if you are not familiar with custom coding as a good plugin will always be maintained by the plugin author to make sure the code is up to date so it won’t cause any issues.
If you find a random solution online then the code won’t be maintained and updated which will probably cause some issues later as you mentioned.
Also code is code – it does not matter if the code is added as PHP snippets or plugins, it’s still code.
Please keep in mind that we can only help with GP related questions in this forum which is explained in the general forum rules:
https://www.screencast.com/t/OQG3gFz2y
Thanks for your understanding ๐