Repeatable Table Creation from JSON file - List of headers, and list of lists for data rows.

let
    Source = Json.Document("
    
    {
   ""count"": 22,
   ""keys"": 22,
   ""headers"": [
      ""ID"",
      ""First Name"",
      ""Last Name"",
      ""Age"",
      ""Campus"",
      ""Member Since""
   ],
   ""data"": [
      [
         ""42311"",
         ""John"",
         ""Smith"",
         ""43"",
         ""Northside"",
         ""Mar 17, 2019""
      ],
      [
         ""56288"",
         ""Tom"",
         ""Peterson"",
         ""65"",
         ""Southside"",
         ""Jul 7, 2006""
      ],
      [
         ""15344"",
         ""Mary"",
         ""Story"",
         ""23"",
         ""Eastside"",
         ""Sep 1, 2021""
      ]
   ]
}
    
    "),
    data = Source[data],
    #"Converted to Table" = Table.FromList(data, Splitter.SplitByNothing(), null, null, ExtraValues.Error),
    #"Extracted Values" = Table.TransformColumns(#"Converted to Table", {"Column1", each Text.Combine(List.Transform(_, Text.From), "|"), type text}),
    #"Split Column by Delimiter" = Table.SplitColumn(#"Extracted Values", "Column1", Splitter.SplitTextByDelimiter("|", QuoteStyle.Csv), Source[headers]),
    #"Changed Type" = Table.TransformColumnTypes(#"Split Column by Delimiter",{{"Age", Int64.Type}, {"Member Since", type date}})
in
    #"Changed Type"

How to use this code: Create a new Blank Query. Click on "Advanced Editor". Replace the code in the window with the code provided here. Click "Done". Once you examined the code, replace the Source step with your own source.

Hi zephyr325, different approach:

Result

let
    Source = Json.Document("{ ""count"": 22, ""keys"": 22, ""headers"": [ ""ID"", ""First Name"", ""Last Name"", ""Age"", ""Campus"", ""Member Since"" ], ""data"": [ [ ""42311"", ""John"", ""Smith"", ""43"", ""Northside"", ""Mar 17, 2019"" ], [ ""56288"", ""Tom"", ""Peterson"", ""65"", ""Southside"", ""Jul 7, 2006"" ], [ ""15344"", ""Mary"", ""Story"", ""23"", ""Eastside"", ""Sep 1, 2021"" ] ] }"),
    ToTable = Table.FromRows(Source[data], Source[headers])
in
    ToTable