String Array Manipulation

Hi Everyone,

the scenario is as following:

I got two string fields where I need to combine them in one field in the following order

@formula = {Field1}[1] & {Field2}[1] & {Field1}[2] & {Field2}[2] & {Field1}[3] & {Field2}[3]

and so on till the last value in the array of each field which needs to be done dynamically

any input would be appreciated