[For future readers]
I am currently in the process of putting my Electron app on a Tinkerboard and have a bit of experience with Electron. If you start your electron app and open the dev tools console and do a window.location.href = 'chrome://gpu' you can get a lot of information about the hardware acceleration being used (HW Acceleration is the biggest problem you will run into with regards to running GUI apps on a SBC) in my case I am running the app with a few flags and plugins ('chrome://flags') in order to get the UI and video playback responsive.
Just something to note Good luck.
[EDIT] h264ify with the following options:
electron . --load-extension=./app/plugins/h264ify --show-component-extension-options --ignore-gpu-blacklist --disable-background-networking --use-gl=egl --enable-remote-extensions --enable-remote-extensions --window-depth=24 --x11-visual-id=33 --wm-user-time-ms=6178063 --flag-switches-begin --flag-switches-end
