iOS Keyboard Extension: Memoji like paste - ios

Apples build in Emoji Keyboard has a section with "Memoji" stickers.
If you tap on any of these stickers (it seems to be a PNG image), then it's automatically inserted into the textfield or into the chat of the current App, for example WhatsApp, Facebook Messenger or iMessage.
Is it possible to get the same functionality with a custom keyboard? Or is Apple using some private API for the Memoji stickers?
I know how to add an image or image data to the pasteboard like UIPasteboard.general.image or UIPasteboard.general.setData(...). But if I do so, the png image isn't pasted automatically into the textfield. The user has to do additional steps and tap with the finger into the textfield and select "paste".

All the mentioned apps use UITextView, upon selection of any sticker the OS adds this image as an NSTextAttachment to the attributedString of the text view

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I see that this app keyboard extension was able to solve this problem https://apps.apple.com/us/app/fonts/id1454061614
This is a new iOS keyboard extension and was able to get the font inside the app and change the keyboard GUI to be the typewriter font, but not the output inside of 3rd part apps
I expect the output to be Typewriter font inside text fields in 3rd party apps

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I want to replace the system emoji as a user is typing out with my own custom emoji image. I know Facebook Messenger is able to do this on their app so I'm curious how does this work? Their app itself can even turn on/off their own custom emojis. Is it just a custom font?
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I am working in custom keyboard app.
When long press in my emojis it's not open in above textField. it's display in bellow iMessage keyboard. see below screen shot.
it's possible to add my image open in above textField.like iOS default emojis.
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I am currently in the process of building a custom keyboard for IOS devices and wanted to add a custom EMOJI keyboard as well. I have a sheet of custom emoticons already created and do not want the user to have to copy and paste into their message like on the Ikea Emoticon keyboard. Is it possible to have a clone of apples keyboard functionality but with my own emoticons?
If you have something similar like below (emoticon icon)
You can make a slideout UIView with a bunch of your custom emojis using UICollectionView. If the user taps on an emoji it would insert your own Unicode Emoji Text (just example).
You will have to make your own if statements if the text contains emoji unicode to make the emojis appear in your text.
This is how I understand it, I might be wrong, if so, please correct me. :)

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