data from Instagantt

Hi I have an issue. because of our company policy we must back up all information about our projects governance in internal database server. We are thinking about using Instagnatt in our solution, but when we added some custom columns into the instagantt, we cannot see any information from them through the asana api interface. I asked Instagantt support and they told me, that we should be able to reach this information through asana api. But it seems that it doesn’t work properly. Does anybody from you have the same problem?