In the app
Global DBs, instance DBs and PLC data types as readable source with structures, comments and start values. Change a structure and let the whole PLC compile against it.
Nested STRUCTs, arrays and comments, the way you would write them by hand.
Change a type and PLC Sidecar lists the callers and compiles the whole PLC.
An export holds start values. Live values stay in TIA online, where they belong.