How to convert std::string to raw string?

I have this string:

std::string str = "t\tt\\";

Can I convert str to raw string so it will be equal no to "t. t \" but to "t\t\\"(like I write R"t\t\\")?

I.e. if I do not use R-literal my symbols like \t \n \ will be replaced to tab symbol, new line character or . And I want convert string var in which this symbols are replaced to raw string in which they are not replaced. So can I convert string with escaping to string without escaping?