How to properly indent in Word merge template?

Question

I have a Word merge template that currently is not indenting properly when a field is too long. Below is an example of the field codes:

Gift:   {MERGEFIELD Main_Name} - {MERGEFIELD Main_Amount}

When this is used, it will for example display like below if the Main_Name field is too long:

Gift:   NameABCDEFGHIJK - 
$1,000

When the Main_Name is too long and the Main_Amount has to go onto the second line, I want the Main_Amount to be indented the same as where the Main_Name begins so for example it should look like this:

Gift:   NameABCDEFGHIJK - 
        $1,000
  

I tried manually indenting the paragraph of the field codes by lining the Main_Amount up along the Main_Name, but this still doesn't change anything.