External API activity with parameter

Hi all,

I'm trying to use the new External API activity to fetch data from an external system. Is there a way to add dynamic query parameters?

I have an URL that looks like this: https://api.fakedomain/some-resource?startDate=DYNAMIC_DATE  

The startDate parameter is dynamic and is calulated by the workflow. In the activity, I couldn't find a way to add query parameters to generate a query like the one above

In the External API activity we can add inbound columns but id does not generate the correct query

What is the correct way to use an URL with a dynamic query parameter? https://api.fakedomain/some-resource?startDate=DYNAMIC_DATE  

Thank you