Katalon Studio partially supports hybrid mobile apps. You can view the supported environments here: Supported environments.
If elements of a hybrid app are rendered as in a native app, Katalon Mobile Recorder/Spy utility can capture elements. You can learn how to capture elements in the Katalon Mobile Recorder/Spy utility in the following documents:
Suppose those elements are rendered in WebView or a Flutter-based app, which are use cases of a hybrid mobile app. In that case, Katalon Studio provides some workarounds for capturing elements in the following documents: