Thank you for the suggestion, @MartinK. I have been working to understand and implement your suggestion, but have yet to successfully get the data I am looking for.
The question has been converted to a suggestion as ESET support confirmed that there is no ability to add a column in a dynamic group which shows the agent version.
This suggestion creates a dynamic group which will show endpoints which meet the criteria. But again it does not solve the initial question of how to show agent version in existing dynamic groups, as its own column. Hopefully the ability to add a column in a dynamic group which shows agent version, as we are currently able to show product version (client software) exists currently, will be added in the next update.