In c# a Raw string can be used to avoid escaping https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/proposals/csharp-11.0/raw-string-literal

for example

var svg = """
          svg://<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg">
                    <circle cx="50" cy="50" r="40" stroke="green" stroke-width="4" fill="yellow" />
          """;

What is the use case? Small demos or apps, that don't want to have all the overhead to add a file to the source code. The code for a pin is a one liner as svg code. But if you have to save the code to a file and do all this things to copy the file to local file system, then it is very hard.

On the other side, it is a enlargement of the code about two additional switch entries and two functions shouldn't be the problem.