The wizard will help you step by step. Just create the custom field, then click "Configure" and then "Edit Sharepoint Settings", and you will be guided through the steps on how to connect your Sharepoint site.
Because sometimes we can't just choose one option.
Using KQL, you can query absolutely anything on Sharepoint and present the results of the search on the custom field dropdown!
Do you have any questions, feedback, or need support? You can reach out here.