New food stall + custom food?

I know that what I want to do is adavanced for a beginner like me hah
But I'm curious about something.

There are many food stalls in the game now, but not from the country I wanted. And I'm pretty much sure there will never be XD
So I wanted to create one myself.

Just an example. If I created a Churros stand like this on Blender:



And I want it to work as a food stand on the game.
To make the game "understand" it, I have to export a food stand from the game and import my mesh in its place. Correct?

But then, I also want to create custom food to buy on It. Let's say that I create 3 different churro flavors to buy.

How do I add those items into the food stall?

I know this is too much and complicated.
But I'm trying to find a tutorial about it and couldn't find at all (maybe because it's too specific?) hah

Do you know any tutorials that could help me just a little?

* Can I create a custom food stall changing the mesh, but keeping the functions?
* Can I create new food and change the food that is sold there?

Thank you so much.