Hello tamika99
I don't use the function, but in this tested the desired function should already give from the Mi Band 6. It's up to you whether you believe the report or not.
https://blog.tink.de/fitness-tr...

Good and cheap: The Xiaomi Mi Band 6

The Chinese supplier Xiaomi only launched a new fitness tracker on the German market this year with the Mi Band 6. The Xiaomi Mi Band 6 is by far the cheapest of the models presented. If you now think that Xiaomi's fitness wristband skimps on functionality, you are mistaken.

The Mi Band 6 is equipped with its own mode for swimming and reliably records the most important data. In addition to swimming style, distance, duration and calories burned, the training watch also measures the SWOLF value.