Dremio Admin users lost after upgrading to version 18

Hi, we have a problem with Dremio after upgrading from 14.x to 18.2. It seems that admin users got lost. I know that there were some changes to roles management and maybe we should first upgrade dremio 14.x → 16.x and then 16.x → 18.x. Anyway is there any way to get those users back? Or at least create new admin users? (not possible now as there is no admin account available)

Dremio is deployed as Helm chart.