How to add a multi-select choice column from SharePoint List into PowerApps? Swagger with REST ??

Hi,

I am working on a PowerApps application which allows an user to select one or more items from a choice column of SharePoint list. However, the content source seems to be ignoring multi-select checkbox columns may be because not supported in PowerApps.

How do I go about adding them via content source because they don't show up? If there are no direct methods, I am planning to connect via a REST service with Swagger file. Has anyone achieved this by customisation via REST or otherwise?