Feed Me: How to format JSON for a table field?
You can do this a number of ways, and essentially just need an array-like structure to represent the rows.

"Table": [
  {
    "one": "Option1",
    "two": "Option2"
  },
  {
    "one": "Option3",
    "two": "Option4"
  }
]


This issue might be related to your feed however. In the dropdown, you have &lt;altTitles&gt; eg: - there should be a value from your feed in there. According to your example, you should also be mapping to altTitles/title.

My example above shows: