Can we create a Panel element in Confluence Server / Legacy Editor?

[Norman Cates]

tldr: Is there a Panel element I can insert in Confluence Server? Or a macro that will convert to a custom panel element in Cloud?

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We are preparing for our Server to Cloud migration. We are investigating removing the Legacy Panel macro and replacing it with a single coloured panel with the title in it, the body of the panel, and a horizontal rule.

Give that the pages will have to convert to Cloud, we would really like to select a Panel macro/type that will directly convert to a native Cloud macro/element.

In Cloud, for our purposes, this is a custom Panel element. Coloured background, text, and no icon.

However, in the table of conversions from Legacy to Cloud:

https://confluence.atlassian.com/confcloud/converting-pages-to-the-new-editor-993930226.html

the Panel macro is shown as not being replaced with a Cloud native macro, like the Panel element. It will just be left intact, but the properties can't be edited. 

It would reduce a lot of work post migration if we could wind up with a macro / element that can just convert to Cloud with no fuss.