Actually, coverting an issue to subtask is not a single step. It involves selecting a parent issue, changing workflows in many cases, updating fields etc. I don't think this can be done via REST and I haven't seen a plugin doing this in bulk.
If the workflow and fields are same and parent is known, you might be able to get away by just setting those fields directly but certainly not advised as a long term solution.
As a Belgian, beer-lover and home brewer, beer is one of my great passions. I love the fact that with just a few ingredients (usually just water, hop and malt) you can create so many different tastes...
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