You can extend the functionality of Google docs using add-ons, which are useful tools written by third parties and added via the add-ons store for Google Workspace. Examples of add-ons for docs include tools to track changes, create diagrams and more.
Note that add-ins must be enabled by your administrator in order for them to be available in Google Workspace.
To add an add-on to docs:
In a doc, click on the Add-ons menu along the top of the screen
Choose Get add-ons
To search for a particular add-in, type text into the Search apps box, then press Return to find all matches:
Once you have located the add-on you wish to add:
Click on the add-on you wish to add
Click on the Install button
Click on Continue
Choose your Google Account to confirm your sign-in credentials
Click on Allow to allow the app to make changes to your Google Docs data
Click on Done to clear the notification message
You can now click on the Add-ons menu to access the add-on:
To remove an add-on no longer needed:
Click on the Add-ons menu along the top of the screen
Choose Manage add-ons
Click on the ellipses next to the add-on you wish to remove
Choose Uninstall
Click on the X in the top-right corner of the add-ons window to return to the doc or sheet