How to add a new search drop down for the Filter by

[emirateskitchen]

I need to have a structural filter for my food items such as Breakfast, Lunch & Dinner for all collections and I need to add for each product these 3 options in a new drop-down. How to add this new searchable filter.

https://berkeleyandlords.com/collections/turkish-cuisine

Currently, I have Availability, Price, Product Type & Brand.

How can I add a new filter?