As of now, there is no way to view yielded rewards in regards to swap fees without the use of an external dApp or tool. Some examples are https://apy.vision/ and https://www.yieldwatch.net/. Some of these tools may also charge a subscription to view data on L2 chains; be sure to read any terms and conditions first.
A manual alternative would be to calculate daily fees rendered through the use of Sushi’s analytics. You can determine the percentage of daily fees you will receive by dividing the total value locked in the pool to the percentage of the pool your own.
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