I can see how to create a custom activity through the api on here https://developer.monday.com/api-reference/reference/timeline-item-ea#create-a-timeline-item

But I cannot find any reference to how to create one with the built-in types as ‘Call Summary’ for example doesn’t show up in the list of custom type ID’s. I need a custom type ID to use the timeline create method. How can I do that?