Displaying only one column of an Airtable in dependency of an app variable


I have created an Airtable which only has one row but around 80 columns. I have already created an “REST API direct integration” data entity for that table.
The first thing my app does is a calculation which sets an app variable, but the result is always a different number.
So lets say the calculation has the result 5 my app variable will also becomes 5. I now want to display the matching column of my Airtable on the screen. So if the app variable is 5 I want to display column 5 of my table and if the app variable is 6 I want to display column 6.

How can. do that?

Thank you for your help!