You can accomplish this by adding a so-called Right Tab stop for the "Acct" variable when the text object is in edit mode.
The following is taken from
the MS Word documentation which offers the same functionality. This should also work for variable text.
You can quickly set tabs by clicking the tab selector at the left end of the [horizontal] ruler until it displays the type of tab that you want and then clicking the [horizontal] ruler at the location you want.
* A Left Tab stop sets the start position of text that will then run to the right as you type.
* A Center Tab stop sets the position of the middle of the text. The text centers on this position as you type.
* A Right Tab stop sets the right end of the text. As you type, the text moves to the left.
1. Make sure the text object is in edit mode (double-click it).
2. Click the tab selector in the top-left corner twice to select "Right Tab".
3. Click somewhere in the horizontal ruler (near the right edge of the text box) to add a tab stop.
4. In the text box, text is left-aligned until you press Tab to navigate to the tab stop. Anything beyond that point is right-aligned.
[Edit: Please click the link to the MS Word documentation to see what the icons for the different tab types look like]