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In the Tesla app, select Energy, then the month view, and then you can start to do the math of the difference between solar generation and home use, but it isn't exact, due errors from the CTs and the parasitic losses in your Powerwalls.
I'm not sure what OP is looking for, but this is the net export, not the total export. In some cases it's interesting to know the actual total exported to the grid in the month, rather than total exported minus total imported.