Concatenating strings with special charactors

we are trying to concatinate three strings including " in it, but Azure data factory adding as ". Question is how do we get rid of \ character. I Have one set variable returning value ABCDEFG and I wanted to concatenate with other data to populate like below in a variable. {"value"}:{"ABCDEFG"}

I am using the syntax in set variable like @replace(concat('{','"','value:',variables('requiredvalue'),'}'),'\ ','') and I am getting output value as "value": "{"value:ABCDEFG}"

Appreciate for help