The plugin strips HTML tags by default. I've looked at the response, those are actually HTML chars but encoded so they can be displayed as is.
I have made a test function, which will try to decode these HTML entities into real HTML tags, so the plugin can strip them later. Add this custom code to the functions.php in your theme/child theme directory (copy from line 3 only!). Before editing, please make sure to have a full site back-up just in case!
Let me know if you need assistance with it.Best,
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