No need to search any further. It's simply not possible at this time. That section of the trade tab displays a running series of data which is not compatible to be exported to Excel. The developers of Thinkorswim could not make this available even if someone requested it.
Stated another way. The Time & Sales is actually a data series much like historical data you see on a chart. We already understand that historical data cannot be exported to Excel from Thinkorswim. So it stands to reason that Time & Sales from any section of the platform would not support being exported to Excel.
If it were possible to export the Time & Sales data it would be converted to static text and would not be updated live on the spreadsheet.