You could also create a fixlet to build XML for a fixlet then post it to the same ID as an existing custom fixlet. This is a method I used for automating Defender updates. Slight different to the approach @vk.khurava suggested in that for my case the fixlet XML is build via the fixlet action, but the concept of formatting the XML and uploading it to the server via API call is the same. Maybe its methods are of some help for your case. This one does upload a fixlet and then deploy it so maybe further than you may be wanting to go.
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