How enabling or active the Garbage Collector G1 in a Admin or Managed Server

Hi community.

I have a doubt, I want to activate the G1 garbage collector in my Oracle Weblogic domain, using the "setUserOverrides.sh" script, but, I don't know how the Shell should be structured internally to invoke only the G1 Garbage Collector and that the managed Server or the AdminServer running without problems.

In addition to that, I have a domain that, in the "setDomainEnv.sh" file, the setSOARefConfigEnv parameter is active, which assigns the size of the JVM heap size, but, when I try to use the "setUserOverrides.sh" file with the memory parameters that I will show below, the managed one does not lift and remains in the "Failed to starting" status.