Not experienced upsizing from classic, nor familiar with what’s available in v2022 but TransView in Kinetic is a ‘dynamic’ system dataview that allows adding columns on-the-fly. Meaning, for example, if you use a row-update to set TransView.SomeField, it will both add SomeField column to the TransView dataview and populate it with the value provided or expression evaluated.
So in my limited experience, TransView often has a single row with one or more columns storing values the app can use in events and rules via epBinding expression syntax denoted by curly braces like {TransView.SomeField}.
Regarding upsizing, check out the post on here DashBoard Dragons. It’s an Insights session on leasons learned uplifting dashboards and they recreated dozens rather than converted, I believe. Using a dashboard template and a dashboards-dashboard, etc. Tons of good advice and they shared the session collateral for download.
Again, sorry you don’t have the debug tools but you may get somewhere with a console-write in your events like trans.getDataView(“MyDataViewName”).data to output the data array to browser devtools console.