Inquiry About Customizing Zendesk Widget Functionality

Hi, we recently incorporate a widget at the checkout page of our website, and the following items are what we would like to achieve:

• To be able to decide which articles to show in the widget
• To be able to decide the order of the articles shown in the widget
• To be able to show more than 3 articles in the widget
• To know how many chats are initiated from the widget 
• To know the trend of content for the chats initiated from the widget  

We tried contacting Zendesk support, and the agent asked us to consult Zendesk Developer Support team instead.
Please advise how we can achieve the above items and feel free to let me know if any clarification on our use case is needed. Thank you!