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Pine Script functions with dynamic length

Hello, what is the correct way to use dynamic length in formulas or it is currently not supported?

example:
down_bar = close > hl2[1]
length = barssince(down_bar)

plot(length>1? sma(volume,length):na )

this code returns error
Error: Cannot call `sma` with arguments (series, series); available overloads: sma(series, integer) => series
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