Append duplicate values with numbers in sequence

[vgautam64]

I have a JSON that has Associate IDs and Attachment IDs. I want to sequence the duplicate attachment IDs for each associate starting with the second duplicate ID, something like '-1', '-2',...
Please refer to the sample INPUT and OUTPUT JSONS attached and please let me know how can I achieve this output.

[vgautam64]

@tstack @dmiller can you help?

[vgautam64]

@bojanvelevski @koryknick @Supratim @djsiegel

[alchemiz]

Hi @vgautam64 ,
Good day, see attached SL pipeline. Hope this helps

Thanks,
EmEm