Statistical functions to calculate exponential trendline

Hi, I am relatively new to app sheet. Would like to know if there is a way to calculate exponential trendline for values in a table based on conditions.

Basically, to obtain results fm the equation : y =aEXP(bx) where
a: =EXP(INDEX(LINEST(LN(y), x), 1, 2))

b: =INDEX(LINEST(LN(y), x), 1)

There is no LINEST() equivalent in AppSheet.

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Thanks Steve.
Is there any work around to calculate exponential trendline

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