You can also use the Document\Document Extras\Secondary Dimension\Convert Dimensions menu command.
You can choose any option for the conversion, it does not matter since you are going to change that text.
It will create a text element below your Dimension Text. You can then select it and edit it to modify it to the value you want.
You may then also group the Dimension with this Text element so they move together.
The same thing can be achieved if you simply select the Dimension Text and Drag a Copy of it, then modify its value.
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