Install Phone Book Add-on
Step 1: Click Get add-ons
In a Google Workspace app (Docs, Sheets or Slides), click on Extensions > Add-ons > Get add-ons.
Step 2: Type Phone Book
Type Phone Book in the search bar and press Enter.
Step 3: Click Phone Book tile
Click on the Phone Book tile from the search results.
Step 4: Click Install
Click Install and follow the steps that appear on the screen.
You are going to be asked to grant permissions and to associate the add-on with a Google account.
Step 5: Click Done
Click on Done to complete the installation.