Yes of course its possible but not from your end even though you have administration privileges. Need to check with Adobe representative dedicate for your account or send a mail to Adobe customer care they will do the needful for you.
For more details please find the below link Configuring Reports section.
Only Adobe Customer Care can change the default currency setting for your report suite after it is being set. When you change the base currency for a report suite, the existing revenue in the system is not converted. All new revenue values will be converted accordingly.
If you wanna change default currency setting, mail to Adobe Experience Cloud Customer Care (CustomerCare@adobe.com).