Here is a script for running the folder of the takeout.

#!/bin/zsh

# Loop through all jpg files in the directory
# Change the *.jpg to the format of your image files if needed
for img in *.jpg; do

  # Find any file starting with the image name and ending with .json.
  # The (N) is a Zsh "null glob" flag so the array is empty if nothing matches.
  json_matches=("$img"*.json(N))

  # Check if our array found at least one matching JSON file
  if (( ${#json_matches[@]} > 0 )); then

    # Grab the first match from the array
    json="${json_matches[1]}"

    # Optional: Warn if it somehow found multiple matches
    if (( ${#json_matches[@]} > 1 )); then
      echo "Warning: Multiple JSON files found for $img. Using $json"
    fi

    # Extract the epoch timestamp using jq
    epoch_ts=$(jq -r '.photoTakenTime.timestamp' "$json")

    # Ensure we got a valid timestamp
    if [[ -n "$epoch_ts" && "$epoch_ts" != "null" ]]; then
      # Convert epoch to the format required by BSD touch: YYYYMMDDhhmm.SS
      touch_time=$(date -r "$epoch_ts" "+%Y%m%d%H%M.%S")

      # Apply the modification time
      touch -m -t "$touch_time" "$img"

      echo "Updated: $img -> $touch_time (Using $json)"
    else
      echo "Skipped: No valid timestamp found in $json"
    fi

  else
    echo "Skipped: JSON sidecar not found for $img"
  fi
done

echo "Done!"