I don't know if you can. Gboard is Google Keyboard. It may need Google Services and may not work on Graphene.

Google essentially abandoned AOSP keyboard and put all of the cool stuff into Gboard. Google has done this with many, many core AOSP apps. Calendar, Messenger, Contscts, etc.

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I use Gboard on graphene and it works perfectly. Only keyboard I can tolerate and I've used a bunch.

The way I have it configured on my phone, Google services is installed but it has zero network permissions. Same with Gboard. Nothing Google on my phone is allowed to network at all.