On multiple occasions, I've wanted a standard format that allows large multi-line text blocks to be unquoted. JSON, JSON5, and TOML don't do that. You know what does? YAML and XML. I'm not really a fan of either of them, but where's the better option that still gives me large unquoted text blocks?
XML is also game for blocks of text with clumsy <xsl:value-of select='$thing' /> scattered through it for an ad hoc string substitution in those unquoted text blocks. Lua has a nice large blocks of literal text notation too.
