HELP:How to add support for a new database in Flowable

In Flowable 7.1.0, the use of Liquibase has been removed. I am in China and need to use the Dameng database. Could you please tell me how I should properly add support for a new database? I have now rewritten org.flowable.common.engine.impl.util.DbUtil and treated the DM DBMS as MySQL, but when starting, it reports an error: couldn’t create db schema: create index ACT_IDX_JOB_EXECUTION_ID on ACT_RU_JOB(EXECUTION_ID_)

@filiphr can you help me?