Since the Apple Card does not have an online portal directly linked to the card, unfortunately it is not possible to link the card to your Personal Capital dashboard.
You can however add this account as an offline account so it will be tracked with your other online accounts and you will be able to see it in your Net Worth calculations. Note that you won't be able to track the transactions at this time but can see the value of the account. For instructions on how to add offline accounts please see our help article: Create a Manual Account