Google announced that it will slowly phase out support for Chrome apps on all operating systems until they will completely stop working in June 2022 for all users. Chrome apps are HTML5, CSS, and JavaScript-based web apps that can be installed via the Google Chrome browser. Google encouraged web developers at the time to migrate their Chrome apps to the web and, if not possible, to convert them into Chrome extensions or use platforms such as Electron or NW.js. Google will continue to support and invest in Chrome Extensions on all existing platforms.
Source: https://www.bleepingcomputer.com/news/google/google-to-kill-chrome-apps-across-all-platforms/