One input mutiple output add line script question

As we can see, I have this one input mutiple output system, what I want to do is delete the line between the 'convert' and 'input' block, then replace input block by 'data store write' block by script. I use get_param function to get the DstBlock of the Input, but there are two DstBlocks as shown below, so I wonder is there any function or method I can use to get the number of DstBlock?

If you know the way to address the issue, please tell me, thank you.

[ciming zhu]

I have the same trouble as you，I wonder that have you solved this problem？