[Scons-users] "${xxx}" problem in env.Textfile source string

[liruncong2018]

Hi,
How to make "${xxx}" in the env.Textfile source string output as it is, without being replaced with an empty string?
str = "${workspaceRoot}\\myPath"
<<<
jsonFile = env.Textfile(
            filePath,
            jsonStr,
            workspaceRoot = str
        )

>>>
Expected output(filePath content):
${workspaceRoot}\\myPath
but the actual output:
\\myPath
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