Mapping Input variables to Loki output plugin labels

[webgps]

Need some help here.
I'm trying to set labels on loki output from multiple input like this:

           [INPUT]
                  Name          tail
                  Tag           system.syslog
                  Path          /var/log/syslog
                  Parser        syslog-rfc5424
                  DB            /var/log/flb_syslog.db
                  Mem_Buf_Limit 5MB

              [INPUT]
                  Name          tail
                  Tag           system.audit
                  Path          /var/log/audit/*.log
                  Parser        syslog-rfc3164
                  DB            /var/log/flb_audit.db
                  Mem_Buf_Limit 5MB
                  Skip_Long_Lines On

.
.
etc..

what I want to achieve is that label service_name can be selected in Grafana as label an returns the value regarding to INPUT Tag or any other flag, for example (Tag):

system.syslog
system.audit

             [OUTPUT]
                  Name          loki
                  Match         *
                  Host          loki
                  Port          3100
                  Labels        environment=prod,hostname=${HOSTNAME},service_name=$Tag

I don't know if its even possible to map theese dinamically to labels

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