How to handle Special character $ in Mule4

From source system we are getting "$" in most of the fields. Mulesoft is throwing error for this.

Getting below error:

"Invalid input '4', expected ~, Function Call, selectors or ?

  (line 6, column 25):

6|       "comment": $4.00 ,

              ^

Trace:

 at payload::main (line:

  6, column: 25), while reading `payload` as Weave at 

6|   

      "comment": $4.00 ,

              ^.

6|

        "comment": $4.00 ,

              ^

Trace:

  at payload::main (line: 6, column: 25), while writing Json

  at 

6|       "comment": $4.00 ,

     ^.

6|       "comment": $4.00 ,

        ^

Trace:

 at payload::main (line: 6, column: 25)"

  evaluating expression: "%dw 2.0

output application/json

---

  payload 

".