There are no additional configuration options for Prometheus Text-Based Format. The metrics are parsed directly into Telegraf metrics. It is used internally in prometheus input or can be used in http_listener_v2 to simulate Pushgateway.
[[inputs.file]]
files = ["example"]
## Data format to consume.
## Each data format has its own unique set of configuration options, read
## more about them here:
## https://github.com/influxdata/telegraf/blob/master/docs/DATA_FORMATS_INPUT.md
data_format = "prometheus"