Dear emilian,
We are sorry to say that this is not as easy as you think to implement this feature and there is no file available to add a code and the feature will implement and work with the system.
If you are looking for a custom feature based on your needs and requirements then please contact there https://www.themelooks.com/contact/ to get a quote for the customization services.
Best Regards,
ThemeLooks Support Team
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