How to add an item to Highcharts legend?

Question

I have a graph with two series: column and spline. Programatically I changed the color of some columns that met some criteria, let's say the 10 lowest scores are rendered in green, while the rest is blue.

Now, in the legend, I have the series names, but it shows, obviously, the spline series name and the column series name in the default blue color. I want to know how to add a name to the legend for the columns that are rendered in green that says "lowest scores" for example.

EDIT:

The code for the series:

series: [{
  type: 'column',
  color: '#215868',
  name: 'Score per round ',
  data: [
    {y:65,name:'Caracas Country Club', color: '#7EB035'},
    {y:72,name:'Biltmore Golf Course', color: '#7EB035'},
    {y:72,name:'Nashua Country Club', color: '#7EB035'},
    {y:90,name:'Hilaman Park Golf Course'},
    {y:105,name:'Biltmore Golf Course'},
    {y:90,name:'Binks Forest Golf Club', color: '#7EB035'},
    {y:90,name:'Binks Forest Golf Club', color: '#7EB035'},
    {y:90,name:'Blackhawk Country Club | The Falls', color: '#7EB035'},
    {y:90,name:'Blackhawk Country Club | The Falls', color: '#7EB035'},
    {y:72,name:'Pembroke Country Club', color: '#7EB035'},
    {y:90,name:'The Greens At North Hills Country Club'},
    {y:90,name:'Havana Country Club | Kilamanjaro/Kenya'},
    {y:90,name:'Biltmore Golf Course'},
    {y:90,name:'Biltmore Golf Course'},
    {y:90,name:'Challenge At Santa Rita'},
    {y:100,name:'Lake Chabot Golf Course | Lake Chabot'},
    {y:90,name:'Hillcrest Golf & Country Club | Championship', color: '#7EB035'},
    {y:100,name:'Hillcrest Golf & Country Club | Championship'},
    {y:100,name:'Hillcrest Golf & Country Club | Championship'},
    {y:90,name:'Hillcrest Golf & Country Club | Championship', color: '#7EB035'},]
  },
  {
    type: 'spline',
    name: 'Avg Score',
    color: '#009900',
    data: [
      {y:89.9,name:'Caracas Country Club'},
      {y:89.4,name:'Biltmore Golf Course'},
      {y:88.9,name:'Nashua Country Club'},
      {y:88.9,name:'Hilaman Park Golf Course'},
      {y:89.4,name:'Biltmore Golf Course'},
      {y:89.4,name:'Binks Forest Golf Club'},
      {y:89.4,name:'Binks Forest Golf Club'},
      {y:89.4,name:'Blackhawk Country Club | The Falls'},
      {y:89.4,name:'Blackhawk Country Club | The Falls'},
      {y:89.0,name:'Pembroke Country Club'},{y:89.0,name:'The Greens At North Hills Country Club'},
      {y:89.0,name:'Havana Country Club | Kilamanjaro/Kenya'},
      {y:89.1,name:'Biltmore Golf Course'},
      {y:89.1,name:'Biltmore Golf Course'},
      {y:89.1,name:'Challenge At Santa Rita'},
      {y:89.3,name:'Lake Chabot Golf Course | Lake Chabot'},
      {y:89.4,name:'Hillcrest Golf & Country Club | Championship'},
      {y:89.6,name:'Hillcrest Golf & Country Club | Championship'},{y:89.8,name:'Hillcrest Golf & Country Club | Championship'},
      {y:89.8,name:'Hillcrest Golf & Country Club | Championship'},
    ]
  }
]

Answer 1

I just added an empty series with the properties needed (name and color) and it worked. Just in case you find yourself in this scenario.