It is supported in JIRA cloud.
The field types you need to add are either Text Field (multi-line) or Text Field (single line).
Then you need to update the field configuration which applies to the project(s)/issue type(s) that where you are using the fields. In that field configuration, you need to set the renderer for your fields to the 'Wiki Style Renderer' rather than the 'Default Text Renderer'.
Sam
One way:
field-renderer.png
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