Undefinded identifier "loadLocation"

I’m trying to set a location in flux query:

option location = loadLocation(name:"America/Denver")

from(bucket: "telegraf/autogen")
    |> filter(fn: (r) => r._measurement == "mqtt_consumer")
    ...

But in result I get error message:

undefinded identifier "loadLocation"

I’m using influxdb v1.7.9 (with flux v0.50.2)

I don’t believe this function has been implemented yet; there is an open issue on GitHub: