If you are trying to get rid of \ without, that part of the
@replace should be '\'. Your example has a space in the replace part, which would only match entries that have \ followed by a space. So, at this point, your replace would look like this:
@replace(concat('{','"','value:',variables('requiredvalue'),'}'),'\','')As for creating the string output you are after, that's as simple as adding extra parts into the strings in your concat like this:
@replace(concat('{','"value":','"',variables('requiredvalue'),'"}'),'\','')
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