Hi @danclarke,
Thanks for your question.
Yes, it’s true that using the “#” causes it to become a YAML comment. One workaround you might consider is using the @@ARRAY_REPLACE@@ syntax instead.
I recommend referring to our Keyword Preservation not Working with Configurations such as Action Secrets and Flow Actions knowledge article for more specifics on how to accomplish this.
Let me know if you have any questions about this.
Best,
Rueben