yes... - inside a PANE you can place a SIZETRANSFER component. This one tells the server about the current size. So place a corresponding PANE into your outest dialog.
If SIZETRANSFER-FLUSH is set to "true" then changes are immediately transferred, otherwise (as usual...) with the next roundtrip.
You can also categorize sizes e.g. e.g. small=upTo400, medium=upTo800, big=upTo100000. In this case the size is not transferred with every pixel resizing, but only if category changes.
In the demo workplace there are examples:
Containers > transfer of actual size
Containers > adaptive containers > Size transfer