Google Ads Integration - "Conversions" doesn't appear in dropdown

I have an issue where I’m connected to my Google Ads account via the API integration, but when I click the metrics dropdown “conversions” is not available at all–I’ve been banging my head against the wall for a couple hours trying to find out why.

Is there a way that I can input custom call information into the API integration module so I can just call the exact column I need rather than selecting from the presets?