Struct Field Hash function with other Fields of the same Struct Set - GoLang

Question

I'm new to GoLang and am starting with trying to build a simple blockchain. I am having trouble creating a hash of the blocks. Can anyone help me with how I could pass the other fields of the struct set into the Hash() function within the same struct, or if it needs to be outside of the stuct somehow, or if it's even possible...

Block Struct

type Block struct {
  Index int
  PrevHash string
  Txs []Tx
  Timestamp int64
  Hash string
}

Set Struct Example

Block{
  Index: 0,
  PrevHash: "Genesis",
  Txs: []Tx{},
  Timestamp: time.Now().Unix(),
  Hash: Hash(/* How do I pass the other fields data here... */), 
}

My Hash Function

func Hash(text string) string {
  hash := md5.Sum([]byte(text))
  return hex.EncodeToString(hash[:])
}

My Imports (if helpful)

import (
  "crypto/md5"
  "encoding/hex"
  "fmt"
  "time"
)