Splunk-spl code formatting doesn't work

Things I have tried

splunk-spl

spl

splunk

Looked on PrismJS documentation, and still without success:

prism/prism-splunk-spl.js at cde0b5b25f15465456b6e2ee6049a433b9f9d634 · PrismJS/prism · GitHub

What I’m trying to do

I am trying to get code formatting for Splunk SPL queries.