InfluxDB inserting data?

Configuration
1

I am planning to use InfluxDB/Grafana/telegraf to monitor some metrics of multiple win10 hosts and have managed to set everything up with default settings. I have downloaded a premade dashboard to grafana that shows alot of info from one of the hosts running a telegraf-service.
But now I need to add some info from that host using a powershell-script.
I have three questions:

1: How I should format and post the data
2: How do I associate the data with the current hostname?
3: How do I then access the data from grafana so that I can add it to a graph

This is what I have:
I add this to the telegraf config:

[[inputs.exec]]
  interval = "60s"
  commands = [
'powershell -File "C:\Program Files\Telegraf\getNetworkadapterInfo.ps1"'
  timeout = "2m"
  data_format = "influx"

This is the powershell-script I need to run, the write-hosts command shows the info I need but I don’t know how I should add this to the body of the post:

$interfaces = Get-NetAdapter | Select-Object "InterfaceDescription", "Status", "LinkSpeed"
foreach ($interface in $interfaces)
{
    write-host "interface=$($interface.InterfaceDescription), status=$($interface.Status), linkspeed=$($interface.LinkSpeed)"
    Invoke-RestMethod -Uri "http://<InfluxDb>:8086/write?db=database&u=username&p=passwrd" -body $body -Method POST
}