[Bug] [Templating] [dot net] stringOrValue pre-built function throws exception when encountering \"

Problem Description

For an adaptive card with the text as
"text": "Title: ${title == \"\"}"
When I do a stringOrValue("Title: ${title == \"\"}") -> The dot net library throws an Invalid expression format exception,

whereas the same text works when tried through the designer (Attached the screenshot below).

Dot net SDK version: 1.2.1

Card JSON

Sample json:
{
    "type": "AdaptiveCard",
    "body": [
        {
            "type": "TextBlock",
            "size": "Medium",
            "weight": "Bolder",
            "text": "Title: ${title == \"\"}",
            "$when": "${title!=\"\"}"
        }
    ],
    "$schema": "http://adaptivecards.io/schemas/adaptive-card.json",
    "version": "1.5"
}

Screenshot

Input in designer:

Output:

Start by reproducing the supplied Adaptive Card expression with the .NET SDK version 1.2.1, focusing on the stringOrValue pre-built function. Done means the expression containing an escaped quote no longer throws Invalid expression format and behaves like it does in the designer.