How to create a custom Drop down menu containing User Metrics

Hi there! 
How can I create a custom Drop down menu containing only ‘Total Users’, ‘Sessions’ and ‘Views’? 
the idea is offering these options for the report customers to select. My guess is I need to create a calculated field. However, I don’t know what syntax/formule I can write for this case. Any ideas? 
Appreciate your support, thanks 

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