Take a look on this tutorial on create iOS Widget with xcode and use it with React-Native Bridge.
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iOS Widget View Styles: https://jaydeepvora.medium.com/configurable-ios-14-widget-using-widgetkit-19e1075c0093
Source code: https://bit.ly/3ESP41j
This article originally posted here: https://www.mustafaalroomi.com/blog/ios-widget-react-native