Even though it is mentioned in https://forum.obsidian.md/t/support-escaping-colon-in-global-search/66390 that
This is already supported for square brackets
\[ \].
it doesn’t return any results:
It is searching for a property with the key "\" as explained.
Delimiting the square brackets with quotation marks " is working:
Nevertheless, it feels awkward having to escape square brackets in search… as proposed with colons too.