Loading JS function into Application Root Pages redwood as of 26C

Summary:

Starting from Oracle Fusion Release 26C, the earlier approach of adding JavaScript to the Unified Module in Advanced mode is no longer used.

When we load the redwood page in VBS now, there is no JavaScript tab available any longer (alongside with Page Designer, Variables - see screenshot below), so we cannot insert JS function that would load our custom ODA widget into our HCM Fusion pages.

Has anyone been able to figure out what is the new process now post 26C? We found this VBS documentation Work With JavaScript but we are not sure if this is applicable to our current VBS version.