How to add colorpad in bpmn

I want to add Custom Color pad in bpmn .

in my source…

export default class CustomContextPad {

constructor(config, contextPad, create, elementFactory, injector, translate, modeling) {

this.create = create;

this.elementFactory = elementFactory;

this.translate = translate;

this.modeling = modeling;

if (config.autoPlace !== false) {

  this.autoPlace = injector.get('autoPlace', false);

}

contextPad.registerProvider(this);

}

getContextPadEntries(element) {

const {

  autoPlace,

  create,

  elementFactory,

  translate,

  modeling

} = this;

function appendServiceTask(event, element) {

  if (autoPlace) {

    //const shape = elementFactory.createShape({ type: 'bpmn:TextAnnotation' });

    modeling.setColor(element, {

      stroke: 'black',

      fill: 'black'

    });

    //autoPlace.append(element, shape);

  } else {

    appendServiceTaskStart(event, element);

  }

}

function appendServiceTaskStart(event) {

  const shape = elementFactory.createShape({ type: 'bpmn:TextAnnotation' });

  create.start(event, shape, element);

}

return {

  'colorlist': {

    group: 'model',

    className: 'bpmn-icon-color',

    title: translate('Set Color'),

    html : '<div class="entry"><button class="picker" id="picker1">11</button></div>',

    action: {

      click: appendServiceTask,

      dragstart: appendServiceTaskStart

    }

  }

};

}

}

CustomContextPad.$inject = [

‘config’,

‘contextPad’,

‘create’,

‘elementFactory’,

‘injector’,

‘translate’,

‘modeling’

];

i want to make this images…
image

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