How to add timestamp to the data pushed to metric by promtail

[bboxerxiaofeng]

Currently, the following configuration in promtail can expose data to metrics
xxx.yaml
- metrics:
GRPCDelay:
source: GRPCDelay
type: Gauge
config:
action: set

promtail_custom_GRPCDelay{Login="100001",Time="2024-09-05 15:05:10.670",filename="/data/server/logs/tradingservice.log"} 2.4105026

Now I want to add a timestamp after the value. How to modify the yaml file?
For example, the logs exposed to the metric are as follows:
promtail_custom_GRPCDelay{Login="100001",Time="2024-09-05 15:05:10.670",filename="/data/server/logs/tradingservice.log"} 2.4105026 1692241058502（time)

[JStickler]

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