Here all possible fields that can be used with {REPORT TICKET DETAILS} tag.
EN.<entity type> Entity Name
EC.<entity type>.<field name> Entity Custom Field Value
TS.<state name> Ticket State
TT.<tag group name> Ticket Tag Value
CA.<calculation type name> Calculation Amount
PA.<payment account name> Payment Amount
T.Department Department Name
T.TicketType Ticket Type Name
T.User User Name
T.Date Ticket Date
T.Time Ticket Time
T.Terminal Terminal Name
T.Tax Total Tax Amount
T.TotalAmount Total Amount
T.RemainingAmount Remaining Amount
https://sambapos.com/wiki/doku.php/custom_reporting_tags
So you can try {REPORT TICKET TAGS:TT.<tag name>:<expression>}