How to get the index of subform in dynamic Forms??

[Former Community Member]

We are creating a Dynamic Form in which there is a field "PAN number" in a block. With the Script, we are replicating the blocks. Suppose there are 10 blocks (hence 10 PAN number fields will be there) and if the user wants to enter the PAN number in any of the blocks, how can we get the index of the block on which a value has been entered?