I need to count the number of words in a complicated diagram with a lot of text boxes.

Grant proposals require a maximum number of words and they also count the number of words in graphs and illustrations. So please just tell me how many words are in a document so I don't have to select and copy paste hundreds of words out of textboxes into a wordcounter (or Indesign). That would be great in the future. This is tw also not possible in Indesign because you need to select the text to get a count, whereas I need to select the textboxes.