Android Security Embedded Secure Element

I am working with Android Keystores (University project) at the moment.
As far as I know it is possible to store keys generated in the app in the secure element (hardware). Does anyone know of an option where I can store self-generated data (for example, keys that are not generated in the app) in the embedded secure element?

I also understood that NFC data can also be stored in the embedded secure element. Would it be possible to store self-generated data here?

I stumble over the open mobile api again and again, but currently get no further.
I am glad about every hint and contribution.

Many greetings

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