Gist for my tutorial: Building a Gutenberg sidebar plugin Part 4: Adding form components. https://vanaf1979.nl/building-a-gutenberg-sidebar-plugin-part-4-adding-form-components/

sidebar-browsertitle.js

/**
 * Local dependencies.
 */
import BrowserTitleField from './BrowserTitleField.js';


class Sidebar extends React.Component {
    
    ...

    render() {

        return (
            <Fragment>

                ...

                <PluginSidebar name="metatags-sidebar" title={__("MetaTags", "metatags")} >

                    <div className="metabox-sidebar-content">

                        <BrowserTitleField/>
                        
                    </div>

                </PluginSidebar>

            </Fragment>
        )

    }

}