You will need to root it. It’s running a very custom android. There is a good documentation about it. Look for DPTTools.
But if you want a epaper tablet with the play store (and certified) look at the BOOX ones (note, air or Lumi). You can install the play store and download the official kindle app.
Some says that BOOX has questionable GPL practices and does some api call in China (might be just telemetry), check in this forum for opinions:).
Damn! I checked the reviews of the Quaderno Gen 2: I am strongly considering this one!
The build quality of the RP1/CP1 is so good (the texture of both the screen and the back is a delight), i hope it feels the same on the Fujitsu.
I’ve got the boox note 3 color for my partner.
It’s 7”, a bit small for me but it’s pretty good.
She loves it but after couple of months she used only the black ’color’ and doesn’t bother to switch to other colors.
I’ve been using a Sony Epaper notebook for almost 2 years now and considering buying a Boox Note 5 or Air 2 (the remarkable didn’t make my short list)
They are running almost stock android and the quality seems better than remarkable.
I’ve watched My Deep Guide (https://youtube.com/c/MyDeepGuide) where they test every single feature of all note taking devices.
This article says that you have root access on the remarkable, but doing so will void the warranty.
All these comments are good. Also ALWAYS watch out for 'Quick Win': When you do something quick and dirty, mark it up for 'refactoring' (i.e. Tech Debt). When your list of quick and dirty builds up, go and clean it. Do not accumulate tech debt, try to keep it low otherwise you will pay full price later (examples up here).
Another great tip that saved me from tons of refactoring: "The wrong abstraction is worse code duplication". Meaning sometimes duplication of code is better than trying to create the wrong architecture (as long as you mark it in your quick and dirty list).