Can I create a json schema to judge datapoints and change color?

plotly.js
1

Hi, all. I wonder if I can create a json file to specify my requirement in plotly. This is my layout:

{
  "font": {
    "family": "Open Sans",
    "size": 14,
    "color": "#555"
  },
  "autosize": true,
  "hovermode": "closest",
  "hoverlabel": {
    "bgcolor": "#888",
    "bordercolor": "#888",
    "font": {
      "color": "#FFF"
    }
  },
  "margin": {
    "l": 60,
    "r": 60,
    "b": 60,
    "t": 35,
    "pad": 10
  },
  "xaxis": {
    "zeroline": true,
    "fixedrange": true,
    "gridcolor": "#d7d7d7",
    "zerolinecolor": "#d7d7d7",
    "rangeslider": {
      "visible": false
    },
    "showgrid": false,
    "title": "Time"
  },
  "yaxis": {
    "fixedrange": true,
    "gridcolor": "#d7d7d7",
    "zeroline": true,
    "zerolinecolor": "#d7d7d7",
    "rangemode": "normal",
    "title": "dose/PH",
    "showgrid": true
  },
  "showlegend": true
}

this is my datapoint:

{
  "connectgaps": true,
  "hoverinfo": "none",
  "hoveron": "points",
  "line": {
    "color": "rgba(5, 149, 219, 1)",
    "shape": "linear"
  },
  "mode": "lines+markers",
  "name": "PH",
  "type": "scatter",
  "fill": "none",
  "marker": {}
}

I want my datapoint or the series be red, if the PH value is larger than 8, meanwhile, be yellow if smaller then 6

Thanks in advanced

Andes