How to find average of last two crossover values of two EMA lines

i am using 5EMA and 10 EMA lines, so how to find the average of last two or three crossover values

The AVG of particular condition or OHLC is possible but, as per your condition the average of last three ema crossover happend can not be defined from tradescript

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is it possible to use if command, like, if crossover is true, set = ref(close, 1)