This is usually done with either a default value or a domain, which are the same in python or xml plugins.
See here :
https://kitware.github.io/paraview-docs/latest/cxx/PluginHowto.html
This is usually done with either a default value or a domain, which are the same in python or xml plugins.
See here :
https://kitware.github.io/paraview-docs/latest/cxx/PluginHowto.html