In traditional UI App an edit inpout rule could be applied to a property to change the value for instance for transformation to upper case.

In constellation UI similar can be achieved by applying a form refresh condtion combined with a data transform on the flow action related to the form.

On property change a patch call to the backend is made to run the data transform.

Edit Input Not Working in Pega 8.8 (support.pega.com)
Configuring dynamic field behavior (docs.pega.com)