Google will soon be releasing Gboard 6.5 version for the Android users. The company is already testing the beta version of the app that features sticker and bitmoji integration along with some tweaks for keyboard and themes.
With this new update arriving, you will soon be able to use Bitmoji with Gboard. Also, the sticker integration allows you to download stickers using various apps like Google Allo and Bitmoji. However, it seems that it does not work with Allo in the beta version, but will be available when the company releases the final version.