Kapacitor get tag value for influxdb series

Hi, I am using Tickscript and my purpose is to run the python script if the value is 0. Below is my code:
`var data = batch
|queryFlux('''
from(bucket: "bucket_name")
|> range(start: -3h)
|> filter(fn: (r) => r["_measurement"] == "measurement_name")
|> filter(fn: (r) => r["_field"] == "field_name")
|> filter(fn: (r) => r["_value"] > 0)
|> truncateTimeColumn(unit: 1h)
''')
.org('org_name')
.period(190m)
.every(30m)

var alert = data
|alert()
.crit(lambda: "_value" > 0)
.exec('python3', 'python-file-location', '--node', '{{ index .Fields "_value" }}')`

I was trying to use template and pass a random parameter, However I am getting “{{ index .Fields “_value” }}” in python file instead of some actual string. My requirement is to pass value of tag column say “A” as an argument to python file. How can I get that value.

Start by reproducing the alert().exec() call with the shown queryFlux and template expression, then trace how Kapacitor handles templates for alert execution and tag values. The issue is done when the documented or corrected approach passes the requested tag value, such as “A”, to the Python script instead of the literal template text.