@aleheux Are you using InfluxDB with InfluxQL or Flux query language? Cause Flux version has only raw editor. You can see the query language type in Datasources → InfluxDB → Query Language.
I checked and there is currently no feature request for visual Flux editor. If that would be useful for you, I recommend to create enhancement request on our github.
You can always use Influx v2 (that comes with Flux query language) with InfluxQL and use visual editor. I have written a short tutorial post on how to achieve this: