Here is a way to work with reports, both standard and custom, in Google Sheets
MANAGER
In Manager select a report to View and then click Copy button
NOTEPAD
Open Notepad an press Ctrl-V (In Mac a comparable software would probably be TextEdit but haven’t tested)
Select Save and when entering the file name add “.htm” to the end. For example Report.htm
GOOGLE SHEETS
Open Google Sheets in a browser
File / Import / Upload / Select a file from your device
you might need to turn Amounts into numbers to work with and this can be done usually by choosing Ctrl F and replace comma (,) with dot (.)
@Lubos, export to htm button would therefore most likely be a good option to have in Manager´s Report module, to skip Notepad and copy/paste chore, as Google Sheets has become a very capable spreadsheet software.