Unable to make Sankey Chart Clickable

Hi Team,

U have created a sankey panel using the business chart plugin with the below code:

return {

series: {

type: 'sankey',

layout: 'none',

emphasis: {

  focus: 'adjacency'

},

data: \[

  {

    name: 'a',



  },

  {

    name: 'b'

  },

  {

    name: 'a1'

  },

  {

    name: 'a2'

  },

  {

    name: 'b1'

  },

  {

    name: 'c'

  }

\],

links: \[

  {

    source: 'a',

    target: 'a1',

    value: 5

  },

  {

    source: 'a',

    target: 'a2',

    value: 3,

  

  },

  {

    source: 'b',

    target: 'b1',

    value: 8

  },

  {

    source: 'a',

    target: 'b1',

    value: 3

  },

  {

    source: 'b1',

    target: 'a1',

    value: 1

  },

  {

    source: 'b1',

    target: 'c',

    value: 2

  }

\]

},

};

How can I make its links or nodes clickable so that I can add drill downs in it.