Bitrix24 Integration: unable to connect form fields to the Bitrix24 custom fields

I'm unable to connect the form fields to the Bitrix24 custom fields. I have the full access API key and have custom fields under "Leads" for the form to connect to but they don't show in the drop-down menus

Sorry, but we actually do not have integration to Bitrix24 CRM available yet.

But, Bitrix24 does provide instructions to JotForm integration https://www.bitrix24.com/apps/?app=integrations24.jotform 

You can follow the steps shown on this page: https://www.bitrix24.com/apps/?app=integrations24.jotform#install 

Meanwhile, let me also forward a request to our back end team for a possible integration with Bitrix24. Though we will not be able to provide a time-frame, rest assured, once this feature gets implemented, we'll notify you via this thread.