The guzheng sheet JSON format

{
  "version": 1,
  "title": "Pentatonic Warm-Up",
  "artist": "Your name (optional)",
  "key": "D",
  "tempo": 88,
  "timeSignature": "4/4",
  "measures": [
    { "notes": [
      { "degree": 1, "beats": 1 },
      { "degree": 2, "beats": 1 },
      { "degree": 3, "beats": 1 },
      { "degree": 5, "beats": 1 }
    ] },
    { "notes": [
      { "degree": 6, "beats": 2, "technique": "tremolo" },
      { "degree": 0, "beats": 1 },
      { "degree": 1, "octave": 1, "beats": 1 }
    ] }
  ]
}

Convert the attached jianpu (简谱, numbered musical notation) sheet music for guzheng into JSON.

Output ONLY a single JSON object — no commentary, no markdown code fence — with exactly this shape:

{
  "version": 1,
  "title": "song title as printed",
  "artist": "composer / source (optional)",
  "key": "D",
  "tempo": 88,
  "timeSignature": "4/4",
  "measures": [
    { "notes": [
      { "degree": 3, "octave": 0, "beats": 1 },
      { "degree": 5, "beats": 0.5 },
      { "degree": 6, "beats": 0.5, "technique": "tremolo" },
      { "degree": 1, "octave": 1, "beats": 2 }
    ] },
    { "notes": [
      { "degree": 0, "beats": 1 },
      { "degree": 6, "octave": -1, "beats": 3 }
    ] }
  ]
}

Rules:
- One entry in "measures" per printed measure. Split at every barline, reading left to right, top row to bottom row.
- "degree": the printed digit 1–7. Use 0 for a rest.
- "octave": dots above the digit → 1 (two dots → 2). Dots below → -1 (two dots → -2). No dots → 0 (or omit).
- "beats": length in quarter-note beats. Bare digit = 1. One underline = 0.5, two underlines = 0.25. A small dot after the digit makes it 1.5× (dotted note, e.g. 1.5). Each dash "—" after a digit adds 1 beat (so "5 — —" = beats 3). Merge tied notes into one note with the summed beats.
- "key": from the "1=D" marking — the letter only, e.g. "D", "G", "Bb", "F#". The app auto-tunes to it.
- "tempo": the metronome marking (♩=88). If missing, estimate from the tempo word.
- "timeSignature": as printed, e.g. "4/4" or "2/4".
- "technique": optional. Use "tremolo" on notes marked 摇指 / tremolo. Omit otherwise.
- Optionally add "youtube": { "videoId": "11-char id" } if a backing/karaoke video is known.
- Grace notes and ornaments: skip them, keep only the main melody notes. For chords, keep the top (melody) note.
- Do not transpose anything — copy the digits exactly as printed. Degrees 4 and 7 are fine: the app plays them by press-bending strings 3 and 6.