It took me a little effort to find this, so I figured that I would do a blog post on it. It’s pretty easy to do. Just follow the instructions on installing Google Play Store. You can find plenty of them. Here are a couple:
https://www.howtogeek.com/232726/how-to-install-the-google-play-store-on-your-amazon-fire-tablet/
https://www.androidpolice.com/2020/07/11/install-play-store-amazon-fire-tablet/
Once you’ve installed the Google Play store, you could go into it and install the Gboard. Hope this works for you! If you have any issues, please comment below.
Thank you for this! Helped my grandpa out with this.