'grafana - data transformation from journald

I would like to clean up the data gathered by promtail. Specifically, I want grafana log dashboard to show only show SYSLOG_TIMESTAMP and MESSAGE fields. The problem is that grafana transform doesn't show fields that are otherwise detected by it. The query I'm using is simple - {name="promtailtest1"}. Any ideas where to start looking?

Detected fields by grafana transform: grafana transform

Detected fields by grafana:

Log labels
job systemd-journal
name1   promtailtest1

Detected fields
MESSAGE "1"
PRIORITY    "5"
SYSLOG_FACILITY "1"
SYSLOG_IDENTIFIER   "promtailtest1"
SYSLOG_TIMESTAMP    "Mar  1 11:15:25 "
_BOOT_ID    "d5f4b43026124bccb1372918ff44fb70"
_GID    "1000"
_HOSTNAME   "pc"
_MACHINE_ID "cce4800beb84473b9cd93f8d6412880a"
_PID    "1902474"
_SELINUX_CONTEXT    "unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023"
_SOURCE_REALTIME_TIMESTAMP  "1646126125653980"
_TRANSPORT  "syslog"
_UID    "1000"
ts  2022-03-01T09:15:25.654Z
tsNs    1646126125654005000


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