How to implement calculating average value of averaged values?

Hi, I'm trying to implement a formula in my layout for a module that calculates the average of 2 averaged values, but I can't do so using the formula custom field. To calculate the 2 averaged values, I could use the formula custom field, but in the custom formula field option, I can't select the fields that store the averaged values to be able to apply the same formula to calculate the average value again. How can I implement this functionality?

For the sake of this discussion, let's use the following dataset, with the rows and column labels in grey coloured text, and the variable names as written. The user is expected to enter the values in column C, and I want the software to calculate average values automatically and display that in the same layout. I am able to use the custom formula field to implement the calculations in column E, but not the calculation in column F.

A	B	C	D	E	F
1	Val1	3		AverageVal12
2	Val2	2		= (c1+c2)/2
3	Val3	4			FinalAverage
4	Val4	5		AverageVal34	=(AverageVal12 + AverageVal34)/2
5				=(c3+c4)/2

I next want to calculate the average value of the two averaged values and this is where I have no option to select variables AverageVal12 and AverageVal34 in the custom formula field to create the formula (AverageVal12 + AverageVal34)/2.

How can I implement ((AverageVal12 + AverageVal34)/2) in Zoho CRM to display this?

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