Loop over a specific key in JSON using Jade

I am working with node.js and using Jade as the template engine. I have JSON response that I am getting from the API.

Fairly standard. This is what it looks like:

Rows: 
{ Row: 
  [ { Header: 
       { ColData: 
          [ { value: 'GS & CO' },
            { value: '' },
            { value: '' },
            { value: '' },
            { value: '' },
            { value: '' },
            { value: '' } ] },
      Rows: 
       { Row: 
          [ { ColData: 
               [ { value: '01/31/2014' },
                 { value: 'Bill' },
                 { value: 'FY/2013-01/2014' },
                 { value: '01/31/2014' },
                 { value: '9963.14' },
                 { value: '9963.14' },
                 { value: '9963.14' } ],
              type: 'Data' },
            { ColData: 
               [ { value: '02/28/2014' },
                 { value: 'Bill' },
                 { value: '02/2014' },
                 { value: '02/28/2014' },
                 { value: '6378.14' },
                 { value: '6378.14' },
                 { value: '16341.28' } ],
              type: 'Data' },
            { ColData: 
               [ { value: '03/31/2014' },
                 { value: 'Bill' },
                 { value: '03/2014' },
                 { value: '03/31/2014' },
                 { value: '2556.0' },
                 { value: '2556.0' },
                 { value: '18897.28' } ],
              type: 'Data' },
            Summary: 
            { ColData: 
             [ { value: 'Total for GS & CO' },
               { value: '' },
               { value: '' },
               { value: '' },
               { value: '27567.44' },
               { value: '27567.44' },
               { value: '' } ] },
      type: 'Section' },

In my server (app.js), I pass the JSON to the view like so:

res.render('home.jade', {title: "hello",
                          reportname: report["Header"]['ReportName'],
                          daterange: "From:"+report["Header"]["StartPeriod"]+" to: "+report["Header"]["EndPeriod"],
                          alldata: report,
                          columns: report["Columns"],
                          rowsperclient: report["Rows"]["Row"]
                        });

In my view, I am trying to build a table using the columns and row data provided to me by the JSON. I am hitting a wall when I want to loop over just the Header parts of each Row.

  // First loop returns total number of records
  // for our API call
  each row, idx in rowsperclient
    each header, idx2 in row
      h5= idx2 +" -> "+rowsperclient[idx]

This gives me the following HTML output:

Header -> [object Object]

Rows -> [object Object]

Summary -> [object Object]

What I am trying to do is display the first value of each header - this is the company name. Then I want to loop over the ColData and display it accordingly.

I can't figure out how to just loop over the Header portion in each row.