its easy to create variables

    module: "compliments",
    config: {
          some_var:"http:......."
           compliments:{..... }
    }

the problem is using them … thru config…

but a couple lines of code in getDom() could make this functional

            compliements:{
                 anytime: [   "whatever", "var:some_var"]

and in getDom

               // existing code (small change const to let) 
		let complimentText. = this.randomC ompliment();
               // new code 
              if(complimentText.startsWith("var:")
                   complimentText= this.config[complimentText.split(':')[1]]

now you would have to do more if the content is html (img src=“var:…”)

                // loop thru the html content
                let lastindex=0
                while(true){
                       let index = complimentText.indexOf('"var:',lastindex)
                       if (index>=0){
                              lastindex=index
                           // some code to extract the var: string  and it variable
                                //using indexOf and slice (note the previous found the " in front of var:   
                           // get its variable value from config
                          // replace the string, and continue from the previous index (lastindex) 
                         }
                         else break;  // out of while loop
                   }