Editable Custom Field on Web Panel

I have a web panel (in my plugin) where I want to edit text values (multi-line).
I need a WYSIWYG editor so I was hoping I could just display the custom field in edit mode on my web panel. The custom field has the wiki renderer activated.

If this is not directly possible is there any other way to bring the WYSIWYG editor to a web panel. I could even get and save the values via an API. I want the editor like the description field in every jira issue.

I know it’s using wiki markup. I even have code to convert between html and wiki markup.