Detect String Encoding type with CodeQL after String extraction

Hello there!

I want to know is there any specific way to detect if a extracted string with codeql has a specific type of encoding?

For example :

We're collecting a string from a function in C/C++ :
`if (strcmp(str1, "ENCODED_BASE64_STRING")) `

the collected string is : "`ENCODED_BASE64_STRING`" .Is there anyway to detect if this string is Base64 Encoded on the fly by CodeQL and it's not of any other Encoding type?

Any support for this?

Thanks