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OK, here we go: A way to inject a string value inside a #YAML string in #Helm chart templates!

You won't like this.

"... {{ $someValue | quote | substr 1 (int (sub ($someValue | quote | len) 1)) }} ..."

I promise you that this is one of *less* terrible ways of performing this extremely fundamental operation.

EDIT: Good news! I've golfed it down to just two function calls:

"... {{ regexReplaceAll "^\"|\"$" (quote $someValue) "" }} ..."

This quotes and escapes the value, then uses a regex to remove just the beginning and ending quote, and finally interpolates it into the larger double-quoted flow scalar.