How to show the total sum value on the top of the stack bar on Tableau

Workaround 1

Use reference line - If the negative exist, the total sum reference line will be placed in the middle of stack bar.

Workaround 2

Use dual axis - Create the second axis and make the marks as text. The total value will be shown, however the total value number is still in the middle of the stack bar if the negative value exist.  

Workaround 3

Creating calculation field and add the calculation field in the label, move the label on the top of the stack bar. The label is only related to some of the category, if the relative category is removed or filtered, the value may be wrong.

Workaround 4

Create annotation instead of dynamic values.