jq cannot iterate over number with join

Question

I would like to add some values from json file separated by pipe. It's working well so far until a value is a number and not a string.

Here what I've done so far: jq -r '.content[] | {seasonTitle, number, name} | join("|")' file.json

I've tried to convert number to string without any success jq -r '.content[] | {seasonTitle, "episodeNumber|tostring", name} | join("|")' file.json

Actual Result:

Top Master||Last Chance / Season 12
Top Master||Épisode 8 / Season 12
Top Master||Épisode 7 / Season 12

Expected Result:

Top Master|236|Last Chance / Season 12
Top Master|235|Épisode 8 / Season 12
Top Master|234|Épisode 7 / Season 12

Here the file.json

{
  "page": 0,
  "size": 3,
  "count": 3,
  "content": [
    {
      "name": "Last Chance / Season 12",
      "releaseDate": "2008",
      "duration": 2100,
      "episodeNumber": 236,
      "title": "Last Chance / Season 12",
      "seasonTitle": "Top Master"
    },
    {
      "name": "Épisode 8 / Season 12",
      "releaseDate": "2008",
      "duration": 7320,
      "episodeNumber": 235,
      "title": "Épisode 8 / Season 12",
      "seasonTitle": "Top Master"
    },
    {
      "name": "Épisode 7 / Season 12",
      "releaseDate": "2008",
      "duration": 7200,
      "episodeNumber": 234,
      "title": "Épisode 7 / Season 12",
      "seasonTitle": "Top Master"
    }
  ]
}