Plantuml and asciidoc on gitlab SaaS

I’m trying to use plantuml to generate an in-line diagram in some asciidoc files on gitlab SaaS

An example of such an inline might be

[plantuml, id=“orgChart”]
-—
@startwbs
* level 1
** level 2a
*** level 3a
*** level 3b
** level 2b
-----

However, when I try and view the .adoc file in the gitlab.com repo view, I get the ‘broken image’
icon, and when clicking on it, I get the following error:

* Thu Jul 21 00:18:13 UTC 2022
* Request that failed: /png/U9npA2v9B2efpStXSW2pofEAkRGKt7svjBGKd4FyWPIMWajcKMfoINwHZe9pVbv9KNwEGa1EObwgWfg2Nsf9UNvHDfegZyIYbFB4ebIG6KukNBeWmEMGcfS2j0O0o0uYMW00
* Status code: 500
* Exception: java.lang.IndexOutOfBoundsException: Index 0 out of bounds for length 0

Is this even supported? Thx