how to add custom functionality on next button of shepherd? I need to add GA events on shepherd pop up box but not able to find how to add an event on click of next button please someone Help

export const builtInButtons = {
  cancel: {
    classes: 'btn-purple-bg me-2 mt-2 sfpro-regular sepheredDone',
    secondary: true,
    text: '<span class="button-text">Done</span>',
    type: 'cancel',
  },
  next: {
    classes: 'btn-purple-bg me-2 mt-2 sfpro-regular',
    text: '<span class="button-text">Next</span>',
    type: 'next',
    
  },
  back: {
    classes: 'btn-purple-bg me-2 mt-2 sfpro-regular',
    secondary: true,
    text: '<span class="button-text">Previous</span>',
    type: 'back',
  },
  stepOne: {
    classes: 'sfpro-regular me-2 mt-2 sepheredStep',
    secondary: true,
    text: '<span type="text" class="sfpro-regular opacity-90 fs-14px ls-28 m-sm-2 ">1 of 6</span>',
  },
  stepTwo: {
    classes: 'sfpro-regular me-2 mt-2 sepheredStep',
    secondary: true,
    text: '<span type="text" class="sfpro-regular opacity-90 fs-14px ls-28 m-sm-2 ">2 of 6</span>',
    type: 'back',
  },
  stepThree: {
    classes: 'sfpro-regular me-2 mt-2 sepheredStep',
    secondary: true,
    text: '<span type="text" class="sfpro-regular opacity-90 fs-14px ls-28 m-sm-2 ">3 of 6</span>',
    type: 'back',
  },
  stepFour: {
    classes: 'sfpro-regular me-2 mt-2 sepheredStep',
    secondary: true,
    text: '<span type="text" class="sfpro-regular opacity-90 fs-14px ls-28 m-sm-2 ">4 of 6</span>',
    type: 'back',
  },
  stepFive: {
    classes: 'sfpro-regular me-2 mt-2 sepheredStep',
    secondary: true,
    text: '<span type="text" class="sfpro-regular opacity-90 fs-14px ls-28 m-sm-2 ">5 of 6</span>',
    type: 'back',
  },
  stepSix: {
    classes: 'sfpro-regular me-2 mt-2 sepheredStep',
    secondary: true,
    text: '<span type="text" class="sfpro-regular opacity-90 fs-14px ls-28 m-sm-2 ">6 of 6</span>',
    type: 'back',
  },
};

export const defaultStepOptions: Step.StepOptions = {
  classes: 'shepherd-theme-arrows custom-default-class',
  scrollTo: { behavior: 'smooth', block: 'center' },
  cancelIcon: {
    enabled: true,
  },
};