Confluence has no way to wrap plain text. I am even afraid to start a discussion because I remember seeing desperate pleas lasting for a decade.
The only work-around that does not involve "asking friendly administrators to create a macro for you" seems placing the plain text inside the "pre" tag in the "source editor" (a little less-than, greater-than <> icon in the top right when editing, possibly a result of administrators installing the source editor plugin). The opening "pre" tag needs a "style" attribute with a value "white-space: pre-wrap".
<pre style="white-space: pre-wrap">PLAIN TEXT WITH LESS-THAN AND AMPERSAND CHARACTERS CHANGED INTO < and &</pre>
I know this is an old post, but I was dealing with it in 2024 and found a workaround for my use case:
Turn on "page layout" and create sections for any long running strings. I used the "single column section" to wrap my strings.
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