EasyReader is supported on all Chromebooks that were launched after 2019, and some older devices that support Android Apps installable from the Google Play Store
A list of supported Chromebooks launched prior to 2019 can be found here:
https://sites.google.com/a/chromium.org/dev/chromium-os/chrome-os-systems-supporting-android-apps
How to install EasyReader and any android application to your Chromebook: https://support.google.com/chromebook/answer/7021273?hl=en-GB