double quote is to surround the string. When a double quote is used inside the string it would confuse the string start/end. Therefore it has to be escaped.
We shared the JSON Lint validator, so you can explore by yourself.
It will be quite difficult because the original JSON is not valid. So basically, no application could parse this Json and UiPath either.
You can try some string manipulation, for instance retrieve this particular Node, split the string with “:” caracter and try to find if there is 0 or more that 2 double caracter in each string of the split table. Replace the extra double qutoe by a simple quote or \".
It’s quite difficult, hard to maintain and not recommanded. So the best practice is to rework the Json file and how the data are inserted.