I try to refuse to believe that there is no Class Range method to retrieve the row or column index for a cell given. But I couldn't find anything searching for this other than the below-refered link.
var activeSheet = SpreadsheetApp.getActiveSheet();
var cellPositionToConvert = activeSheet.getRange("B3")
// cellPositionToConvert ".GETCOLUMN()" ".GETROW()"
Return I'm looking for:
[2, 3]
I could only find this "famous" self-constructed function to deal with that. I would be more than kneen to know and discuss, if there are any other ways to convert this a1Notation.