How to add paragraph action (Custom Action) to react-native-pell-rich-editor

How to add paragraph action (Custom Action) to react-native-pell-rich-editor. The docs aren't clear about it, check it out https://github.com/wxik/react-native-rich-editor?ref=morioh.com&utm_source=morioh.com

<RichToolbar
editor={that.richText}
actions={[
    actions.setBold,
    actions.setItalic,
    actions.insertBulletsList,
    actions.insertOrderedList,
    actions.insertImage,
    'customAction',
]}
iconMap={{
    customAction: customIcon,
}}
customAction={handleCustomAction} />