Implement the same idea used for passing SINK config properties to DatabaseHistory.

For the DatabaseHistory the SINK config properties are passed in DebeziumServer:

configToProperties(config, props, PROP_SINK_PREFIX + name + ".", DatabaseHistory.CONFIGURATION_FIELD_PREFIX_STRING + name + ".", false);

It can be done the same for the OffsetBackingStore:

configToProperties(config, props, PROP_SINK_PREFIX + name + ".", "offset.storage." + name + ".", false);