No, there is no way to query the the current item from expression-group. You could try to switch the expression into a calculated dimension (which could be queried per getcurrentfield) or you used an expression-switching per variable or field-selections or similar.
If you give each expression a descriptive label, you can display the label for the selected expression as a chart title. The label will also appear as the column header in a table.
But there is no way of reading it to act in some way or other
HTH
Jonathan
Logic will get you from a to b. Imagination will take you everywhere. - A Einstein
