Change UI5 CDN URL before generating Adaption Projekt in VS CODE

Hi Folks, we are currently working with a Fiori adaptation project in VS CODE, but we are unable to select the required UI5 version (Screenshot). The error message indicates that the project is using the UI5 resources from ui5.sap.com by default. Our requirement is to use the UI5 version provided by the connected ABAP on-premise system instead of accessing the UI5 libraries over the Internet.