Hello!
Tested with no luck as

import { withTheme } from 'react-jsonschema-form';import { Theme as MuiTheme } from 'rjsf-material-ui';const MuiForm = withTheme(MuiTheme);  finalSchema.buttonLabel = "my label";  finalSchema['ui:options'] = { addButtonLabel: 'my label' };

And later:

        <MuiForm          schema={props.schema}          ref={props.formRef}          uiSchema={finalSchema}...

I'am getting default hardcoded "+add Item" anyway for schemes supporting arrays if items.

On examples pagehttps://cybertec-postgresql.github.io/rjsf-material-ui/ here are "Custom array" example and "Arrays" example. In latter to translate button I need to putui:options.addButtonLabel to every parameter to translate. But can I use something like "default label" for any parameter.

Use case - I need to just translate default "add item". Not customize for parameters.