Hi Monasr,
Thank you for contributing to this theme !
This feature is outside the scope of what we can provide with our theme. This feature was developed by our team and I’m afraid it’s too specific to integrate into our themes. Therefore, we will not add this task to our list to implement your request in the future.
To our knowledge, there is no plugin that you could install to add this feature to your website. To get something similar, We think that this feature requires custom development work. In consequence, our recommendation is to hire a freelancer to this job for you.
If you’re on a tight budget, we recommend you to require the services from Envato Studio freelancers (https://studio.envato.com/explore/websites-programming). This web platform gives you access to developers who have already experience with theme customizations, and for very competitive prices.
Thank you for understanding.