external database

Dropdown list with data from external DB in Bonita BPM Community

I would like to configure dropdown list widget in form that list data from external DB. As I am using Bonita BPM Community it is not possible to use connectors in forms. As I understand the only option to retrieve data in this case is to write a groovy script that will query data from DB for this widget. Is it correct? Or are there any other options?

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