Hi Pheeraphat,
We have analyzed your scenario at our end, and we have attached the sample for your reference, kindly make use of it. Plotbands can be set to all our cartesian charts by simply using plotBands property in the respective axis.
For more information related to the plotband, you can refer to the following help document.
In this sample, as per your requirement, we provided the annotation with candle series and you can change this as per your scenario.
Screenshot:
Also, from the given screenshot, we suggest that you can also use the annotation feature to place the required widget at the required position. To know more about annotation, refer to the following help document.
We have sample in which we placed the text using the annotation as watermark, you can refer to the following link for the sample code.
Also we have sample using the plot band in our sample list which can be found below
Please revert us if you need any further assistance.
Thanks,
Dharanitharan. P