Note : Few things do exist in chrome but not in chromium so I am not sure if we can use it for further changes with chrome not being an open source project or part of chromium codebase.
Accessibility Features
[x] Text size: Option to customize text size of the web content for better readability.
[x] Reader mode: Renders webpage in reader-friendly view.
[x] PDF Support: Support to read PDF documents and render webpage in PDF format.
[x] Page Zooming: Allows users to zoom in and zoom out within the page.
[x] Desktop mode: Allows user to view any webpage with full desktop functionality in mobile device.
[x] Dark & Light themes: Allows user to browse in visually comfortable color theme.
Privacy Features
[ ] Personal/Sensitive Data Handling: Options for denying sharing of data.
[x] Third-party Cookies: Support cookies with consent from user.
[x] Login Credentials: Allow users to save & clear login credentials.
[x] Clear Browsing Data: Allow users to clear cookies, history and cache through browser settings.
[ ] Pop-up Blocking: Provide an option for users to block or allow a pop-up from a site in that session.
[ ] Ad Filtering: Allow users to block/filter intrusive and annoying ads along with an option of acceptable ads.
Add-on features existing in chromium
[x] Quick links: Provide users the options to enable quick links in home page for frequently visited pages.
[ ] Anti-tracking/Secure Mode: Helps user to browse anonymously and avoid being tracked based on the browsing habits.
[ ] Data-Saver Mode: Mode to reduce the data consumption while browsing. (Deprecated now)
Tracker for all the features over and above of existing Chromium.