Support for custom encoder function?

[benallfree]

Hi, I'm very new to Go so I apologize if this is an ignorant request.

Is there a way, using this lib or some other, to implement a custom value encoder?

In JS, JSON.stringify accepts an optional encoder parameter:

const encode = (key:string, value:any)=>{
   // inspect the type of `value` and return whatever you want
}

Is there anything similar for Go?