SP Lists – JSON Conditional Formatting Based on Other Columns

I'm trying to configure conditional formatting for my SharePoint list, based on the value of different columns.

Here is what I was trying to put in place:

(1) IF @ ColumnName1 = "status 4" THEN @ ColumnName2 will be highlighted in red if the cell is empty.
(2) IF @ ColumnName3 = "" THEN @ ColumnName4 will be highlighted in red if the cell is empty.

And more functions similar to them.

I've written some code, but I'm not sure how to create an argument reference to another column. How can this be done?

Thank you in advance.