counting words in highlighted regions

I have a file, in certain regions of which
I should count a total number of words.

Using <g C-g> does not allow to automate this process
as it shows a number of words in a highlighted region
in a "message row" of vim, which I have to read and
retype it to calculator.

Is there any way to get a number of words in a highlighted
region to the "+ register? Or, even better, to add
(or concatinate via the plus sign) a number of words
in a highlighted region to the number already in the "+ register?


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