now it is finished. The easy way, you will need to select dimensions.
then go to the properties window scroll down a little (see below image)
locate suffix and paste your copied symbol here it will automatically add that suffix in selected dimesnions.

Just do the following step where you need to copy just that small 5.
or
follow below step to use this method in a proper way.
first, go to in text editor > right-click >
1. Select "Symbol" from the drop-down list.
2. Select other

here you will get a symbol window scroll down to just a little more than half as shown in the below img.
3. select that small 5
4. click on the select button
5. click on the copy button.
now, you have copied that symbol

go to dimension style manger
select your dimension style.
6. click on modify
7. go to the primary unit tab
8. locate suffix
9. past your copied symbol here in space.
