Hello,
Your question is slightly unclear to me. As my colleague @chung.horng already mentioned here, you will need to change the Render Type in Symbology on QGIS to Singleband Gray and select the band respective to the date in the userdata.json file. This way, you can get the NDVI for different dates.
For example, if your time range is from 1st July 2022 to 11th July 2022, and this results in 2 acquisitions (on 4th and 9th July), then Band 001 would be the NDVI for 9th July and Band 002 will be the NDVI for 4th July.