I want the strategy to work only when there is a high volatility of 20% in 15 minutes, in which parameter should I set this?

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I want the strategy to work only when there is a high volatility of 20% in 15 minutes, in which parameter should I set this?

: Strategy settings

These conditions can be set in the Filters tab of the strategy settings, using the following parameters:
Delta2_Type=15m (Select an additional 15 minutes delta)
Delta2_Min=20 (Value of additional delta, not less than %).
Delta2_Max=10000 (Value of additional delta, not more than %).