Iecst not supported in codeblock

iecst is listed a syntax highlighting available on prismjs (and testing it on their site does work), but it doesn’t work inside Obsidian

Steps to reproduce

IF APPLE = JONO THEN
	//eat something
	EAT:= TRUE;
ELSE
	//don't eat
	EAT:= FALSE;
END_IF

Expected result

syntax highlighting

Actual result

no syntax highlighting

Environment

SYSTEM INFO:
Obsidian version: v0.15.9
Installer version: v0.15.9
Operating system: Darwin Kernel Version 19.6.0: Tue Jun 21 21:18:39 PDT 2022; root:xnu-6153.141.66~1/RELEASE_X86_64 19.6.0
Login status: not logged in
Insider build toggle: off
Live preview: on
Legacy editor: off
Base theme: dark
Community theme: none
Snippets enabled: 0
Restricted mode: on

RECOMMENDATIONS:
none


Additional information

editor and reader use two different parsers.