Add box to a WBS diagram

Question

Is it possible to add box to a WBS diagram, such as UML?

@startuml
box "Internal Service" #LightBlue
participant Bob
participant Alice
end box
participant Other
Bob -> Alice : hello
Alice -> Other : hello
@enduml

Answer 1

This not a box but it achieves the same effect.

@startwbs
* Creole on WBS
**:==Creole
This is **bold**
This is //italics//
This is ""monospaced""
This is --stricken-out--
This is __underlined__
This is ~~wave-underlined~~
--test Unicode and icons--
This is <U+221E> long
This is a <&code> icon
Use image : <img:https://plantuml.com/logo3.png>
;
**: <b>HTML Creole
This is <b>bold</b>
This is <i>italics</i>
This is <font:monospaced>monospaced</font>
This is <s>stroked</s>
This is <u>underlined</u>
This is <w>waved</w>
This is <s:green>stroked</s>
This is <u:red>underlined</u>
This is <w:#0000FF>waved</w>
-- other examples --
This is <color:blue>Blue</color>
This is <back:orange>Orange background</back>
This is <size:20>big</size>
;
**:==Creole line
You can have horizontal line
----
Or double line
====
Or strong line
____
Or dotted line
..My title..
Or dotted title
//and title... //
==Title==
Or double-line title
--Another title--
Or single-line title
Enjoy!;
**:==Creole list item
**test list 1**
* Bullet list
* Second item
** Sub item
*** Sub sub item
* Third item
----
**test list 2**
# Numbered list
# Second item
## Sub item
## Another sub item
# Third item
;
@endwbs