Help with custom shield break sound

this is something i added to sounds.json
"custom.armor_break": {
    "sounds": [
      "armor_break"
    ]
  },
"item.shield.block":{
  "replace":true,
  "sounds": [
    "sounds/shield_sound"
  ],
    "subtitle:":"subtitles.entity.item.block"
  },
  "item.shield.break": {
   "replace":true",
   "sounds": [
    "sounds/shield_sound"
  ],
     "subtitle:":"subtitles.entity.item.block"
},
minecraft\sounds\shield_sound.ogg is the sound, how do i fix it?