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You can put the generated table (whole TableViewMerger macro configuration) into a chart macro to build nice charts and graphs over your data. Consult Atlassian documentation on how to use the chart macro: https://confluence.atlassian.com/doc/chart-macro-163415075.html

Bonus:

To illustrate how to count registrations by user name, in other workds by metafield "createdBy"

You will need to configure your TableViewMerger macro like this

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What if you want to count the records, but have multiple fields as a grouping key?

The concept is the same. Fields without expressions are taken in to form a unique key for the record. Let's say we want to group the records by createdBy and our "name" field

The configuration for TableViewMerger will be then 

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