Dear
I think you can add the connection as you can use a normal MySQL.
To do this you can following the information on https://knowage-suite.readthedocs.io/en/6.4/installation-guide/manual-installation.html#datasource-link-within-the-applications
and https://knowage-suite.readthedocs.io/en/6.4/administrator-guide/configure-data-sources.html
In particular: Connection to business data and Datasource link within the applications
Best Regards
Angelo