IDE Script to move property value

Just updated to 2020 r2.1 and I have some minor troubles with a custom label subclass I wrote some time ago, so I decided to refactor it.
Is it possible to write an IDE script that moves the current value of the “text” property in each subclass instance in the whole project to a new TextValue property I’ve added to the subclass ?
I’ve hundreds of labels on my projects, so doing by hand is not an option.
Any suggestions/ideas are welcome.