Custom Item Sets in the new Client

Is there a tool to get new item sets without the feature being in the new client? Since my old custom sets are still available, I'm pretty sure that you can make custom item sets somewhere else and put it in the right folder to make it available ingame. I just don't know the custom item set's location on my computer and I'd need an online tool for creating the new custom item sets with the right coding and download them.
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