`textTransform` is supported property by react-native. There's no reasons to avoid this property inside eva mapping. `react-native-kitten` should be [updated too](https://github.com/akveo/react-native-ui-kitten/blob/04481cec49a78f859c4cde65a45b157770ea1439/src/components/ui/button/button.component.tsx#L170) in order to support `textTransform` property inside mapping.