I have a spreadsheet that I created using Python and openpyxl, and I'm trying to create collapsible columns that look like this: 
I know which row and column numbers I want to make collapsible. Intended functionality is that whenever anyone opens the Excel file, they should be able to click the (-) and (+) buttons to expand and collapse rows.
I don't even know is this possible (if Excel provides this as a modifiable attribute that some code could edit), but if it is - how do I achieve this using Python?