Jira Data Center to Jira Cloud Migration - Is it possible to migrate in steps?

Hello,

we are migrating Jira from Data Center to Cloud, and we have a ZenDesk integration.

I saw this article: https://support.zendesk.com/hc/en-us/articles/4408830699546-Migrating-the-Zendesk-Jira-integration-when-moving-Jira-instances

The migration guide seems to be quick and simple, but it just talks about a switch from DC to Cloud.

Since we are on a big instance, we are planning a migration in more steps.

How would it work in this case? Is it possible to migrate projects in more steps? Or is it required to migrate all ZenDesk projects at once?

Thanks a lot!

Roberto