Send Bird Chat SDK mix of Java and Kotlin files

After examining the Send Bird Chat SDK, I noticed a mix of Java and Kotlin files. Our App is entirely in Java, making integration complex.

Additionally, each feature (Calls @Mentions, Polls etc.) has its own SDK, with some in Java and others in Kotlin.

Specifically, the 1-to-1 direct calls SDK is in Java, while the Group calls SDK is in Kotlin. Given that our App is written entirely in Java, integrating these SDKs poses a challenge.

Is there any SDK are fully in Java. Kindly support this.