Hi Pim,
Did you link the library in your custom developer app? Looking at the github repo for this Library you need to follow an additional step for iOS installation, which won’t work with the Make It Native app. This step is called linking and makes sure that the Javascript code of the NPM library you use is linked to the necessary native code written in Swift or Java/Kotlin for respectively iOS and Android. https://reactnative.dev/docs/linking
If thats the case, you can create a make it native app yourself with XCode (Mac) https://docs.mendix.com/howto/mobile/how-to-devapps#4-2-ios
Once you done that, you can follow the step called Installation in Bare React Native project (as Mendix Native is not based on expo).