How to get list of campaigns to assign to blog post?


I am using hubspot api to post blog articles… There is a field “campaign” and “campaign_name” ( ) that can be filled with campaign GUID and name correspondingly… But I can’t find a way to show the list of available campaigns to the user so they can select the campaign from dropdown as we can do inside hubspot control panel “settings” page for blog post. Please see the attached screenshot.