It depends. In answer to your question, Form 1099-DIV supporting details should show you the amount of the dividends that directly pertained to the foreign tax paid. This is the amount that should be included as foreign source amount.
However, if the total foreign tax paid is under $300 ($600 married filing jointly), then Form 1116 does not need to be included. The credit can be claimed directly on Schedule 3.
To enter this in TurboTax, it must be entered in two steps.
First, report it on the form as received.
Second, utilize the Jump to link described here: Where do I enter the foreign tax credit (Form 1116) or deduction for 2019?
Click the links for more details.
Filing IRS Form 1116 to claim the Foreign Tax Credit
2019 IRS Publication 514 Foreign Tax Credit for Individuals
