Jenkins use return value from function as variable

Question

I am working on a global library for my Jenkins installation. My function should read from an external vault and return a secret which will be used inside the body of the function.

Basically, I am trying to replicate the flow of the 'withCredentials' plugin of Jenkins:

withCredentials([usernamePassword(credentialsId: 'Github_Credentials', passwordVariable: 'TOKEN', usernameVariable: 'USERNAME')]) {
                
    sh "git clone https://$USERNAME:$TOKEN@${repository}"
                
    // do stuffs
}

How can I write a function that can handle the return values/variables as arguments of the function itself?

My function is something like this:

def call(Map config, Closure body) {

    def secret_id = config.get("secret_id").toString()
    def type = config.get("type").toString()


    // do stuffs 
    body()
}

Is this possible?