Open api/testfld/models/testfld.settings.json add :
"color": {
"type": "colorpicker",
"columnType": "string"
}
Custom type representation based on this component: plugins/colorpicker/admin/src/components/colorPicker
At this file :
plugins/colorpicker/admin/src/index.js
you need to add :
strapi.registerField({ type: "colorpicker", Component: ColorPicker });
colorpicker - name of my custom type