Thanks for posting in the Lucidchart community! The Org Chart experience enables you to link Employee data differently than you'll be able to with a Mind Map, but you can still link data! To do so, click on the 'Data Linking' button on the right-hand side of the page:
From here, you can click 'Link Data' to link employee data to a certain shape or group of shapes. If you choose to import data from Google Sheets you should then be able to update the data in this same tool. For more information about Data Linking and its functionality in Lucidchart, take a look at this article in the Lucidchart Help Center. Let me know if you have any questions!