Heart Rate Monitor While Swimming (F6s Pro)

Hi there,

Yesterday I found that the "HR monitor while swimming" function can only provide an "Average" value but not a chart like real-time Heart Rate recording (similar to Running activity stat)

and in Heart Rate report, the HR line discontinues while in my swimming activities.

Question:

- Is this normal and what's called "HR monitor while swimming" on F6s Pro?

- Is there a way to consecutively monitor AND RECORD the Heart Rate so that in activity report > Heart Rate AND Heart Rate report show the consecutive line (similar to Running)? 

I remember the Garmin Swimming Watch can make it, not sure if it's possible on F6s Pro.

Please advise.

Thanks!