If you're talking about things like TOTP token apps, I'd expect there to be a possibility to do that.
The protocol isn't that complex, so worst case you can write your own. (I've ported the TOTP protocol to get a 6 digit nixie clock to generate my tokens, lol)
The more fancy ones that pop up a message (like in iOS or with Google Play Services) probably won't be supported.
For some reason, when the KaiAuth developer tried to submit it into the KaiOS app store, KaiOStech rejected it because it doesn't "match the use case for majority of our users".
The protocol isn't that complex, so worst case you can write your own. (I've ported the TOTP protocol to get a 6 digit nixie clock to generate my tokens, lol)
The more fancy ones that pop up a message (like in iOS or with Google Play Services) probably won't be supported.