A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
You can link chart text items, such as title, axis title or data labels to cells.
http://www.andypope.info/tips/tip001.htm
The same approach can be used to link autoshape textboxes to a cell.
You will need to use a helper cell to build the text and value parts. So assuming the value is in A1 you could use the following in B1 and link that cell to the textbox
B1: ="Size of text group = " & A1
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