How does one set GRANT permissions with ServerQuery

TS3-Sever Version: 3.13.3 on Linux
TS3 Client-Version: 3.5.6
used commands: login, use, permissionlist, servergroupaddperm

Hello,
i want to know how i can change the “Grant”-Permission ? With “servergroupaddperm” it is not possible OR not documented.

Kind regards