Hi Kvak, I didn't explain it correctly. I was referring to the Reg MA Effciency Ratio Reg FEMA Efficiency Ratio averages.
In fact, I have the impression that I saw an Efficiency Ratio Reg MA ATR made by Loxx on Tradingview.
He was my inspiration for the idea for this one.
Once again, I thank you so much!!!

EDIT: my idea come from this indicator:
// This source code is subject to the terms of the Mozilla Public License 2.0 at https://mozilla.org/MPL/2.0/
// © loxx
//@version=5
indicator("ER-Adaptive ATR [Loxx]",
shorttitle="ERAATR [Loxx]",
overlay = false,
timeframe="",
timeframe_gaps = true)
greencolor = #2DD204
src = input.source(hl2, "Source")
period = input.int(14, "ATR Period")
mper = (period > 1) ? period : 1
mfast = math.max(mper / 2.0, 1)
mslow = mper * 5
mperDiff = mslow - mfast
noise = 0., aatr = 0.
diff = math.abs(src - nz(src[1]))
signal = math.abs(src - nz(src[mper]))
noise := nz(noise[1]) + diff - nz(diff[mper])
avgper = (noise != 0) ? (signal / noise) * mperDiff + mfast : mper
aatr := nz(aatr[1]) + (2.0 / (1.0 + avgper)) * ((high - low) - nz(aatr[1]))
ratr = ta.atr(period)
plot(aatr, "ER-Adaptive ATR", color = greencolor, linewidth = 2)
plot(ratr, "Regular ATR", color = color.white, linewidth = 1)