Got excited to find:
Creating a Database Instance with Preconfigured Repository Using Database Templates
Templates can be download at:
Database Template (with EM 13.3.0.0 repository pre-configured) for Installing Oracle Enterprise Manager Cloud Control 13c Release 3 (13.3.0.0)
Got disappointed to find template is only available for 12.1.0.2.0 DB and 18.1.0.0.0 DB.
Creating a Database Instance with Preconfigured Repository Using Database Templates Caution:
Make sure that the 18.1.0.0.0_Database_Template_for_EM13_3_0_0_0_.zip file is used only for Enterprise Manager Cloud Control 13c Release 3.
It looks like the template version must match exactly from an example below.
EM 13c: Creating an Enterprise Manager 13c Cloud Control Repository using a Database Template Fails: ORA-00603: ORACLE server session terminated by fatal error (Doc ID 2291220.1) While the 12.2.0.1 version of the database is supported for EM 13.2 repository use, a database template for the EM 13.2 repository database is only supplied for the 12.1.0.2 version of the database, and they are specific for the version:
Oracle skipped 12.2 DB version when creating DB template which is disappointing.
Does database really need to be on 12.2?