You can use the following Multiline Editors the DataForm provides:
.NET MAUI Editor
Other properties that are common for all editors are listed in the Editors Overview article.
You can easily style the editors using the properties BackgroundColor, BorderColor and BorderThickness. You can additionally style each editor by applying a style with the same target type as the underlying control.
For more information about how to style the editors, review the Editors Styling article.