Default color for not defined groups in vis network

my example code:

const nodes: [
  {
    id: 1,
    label: 'one',
    group: 'group1'
  },
  {
    id: 2,
    label: 'two',
    group: 'group2'
  },
  {
    id: 3,
    label: 'three',
    group: 'group3'
  },
  {
    id: 4,
    label: 'four',
    group: 'group4'
  },
]

const options: {
  groups: {
    group1: {
      color: {
        background: 'red'
      }
    },
    group2: {
      color: {
        background: 'blue'
      }
    },
    group3: {
      color: {
        background: 'green'
      }
    }
  }
}

In above code, there are 4 nodes with 4 different groups, but there are only 3 groups defined in options. Is there a possibility to define one default background color for groups that aren't already defined? For now Vis Network uses colors from its color pallete. I've tried to set background color in nodes options for all nodes but it seems to be ignored. Thanks!

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