Price Channel Strategy

Hi All,

I'm new to NT8. Typically, most platforms I've used have an ample library of staple strategies to include Price Channel. However, I do not see these on NT8. Can anybody help code these for?

It's literally a couple lines of code:

strategy("Price Channel Strategy", overlay=true)
length = input(20)
hh = highest(high, length)
ll = lowest(low, length)
if (not na(close[length]))
strategy.entry("PChLE", strategy.long, comment="PChLE", stop=hh)
strategy.entry("PChSE", strategy.short, comment="PChSE", stop=ll)

<-- This is from trading view.

I would like to be able to vary the input and switch from long only/short only/long & Short

Thanks!!