Customize The Events Calendar order of columns in the CSV export

I am customizing the CSV export in the Events Calendar plugins. I already added the custom columns that I need thanks to this code: https://gist.github.com/andrasguseo/6caca108be48c0446ce97a080a5eced5

But now I hit the wall with something that should be easier. I want to add the new custom columns at the end, not in the middle of the other columns. Can someone here shed some light or give me pointers?