When you add the EU region under the tax settings, Chargebee adds the default tax rates for all its 28 member countries.

 
To edit/delete the tax rate for a specific country in the EU, go to Settings > Configure Chargebee > Taxes and Click on the EU Region (under Regions section). Here, you can edit the tax rates for each region by clicking on the Edit button.

Note: Chargebee does not provide an auto-update function for taxes. So any changes in the taxes would need to be manually updated by you.

EU VAT tax configuration in Chargebee