hi,
you cannot, the Env name is hardcoded in the code.
But it is read only at boot, so you can use the same, in addition if you have 2 “users” one per instance you could define the DHIS_HOME as user ENV
in version 3.8, you will be able to use tomcat context so you could run 2 DHIS2 instances on the same TOMCAT instance.
br