Currently, there is no direct method to display Jira Assets from a Jira Data Center instance in Confluence Cloud. The integration between Confluence Cloud and Jira Data Center primarily supports displaying issues, linking issues to pages, creating issues from Confluence, and using Jira charts and gadgets. However, these features do not extend to Jira Assets.

Please add this app to enable connection from Jira DC to Confluence cloud

Jir DC to Confluence DC - Assets-confluence-macro?tab=overview&hosting=datacenter