prometheus process is running with root user unnecessarily

At this moment, the snap installs a systemd unit file without specifying a user to run prometheus so root is used. It listens on port 9090 so it could be run as non-root user.

$ snap list prometheus
Name Version Rev Tracking Publisher Notes
prometheus 2.20.1 32 2/stable canonical-is-snaps -

$ ps aux | grep '/snap/prometheu[s]'
root 787517 0.0 0.0 4632 856 ? Ss 01:40 0:00 /bin/sh /snap/prometheus/32/bin/prometheus.wrapper
root 787554 2.2 18.9 939060 189472 ? SLl 01:40 0:01 /snap/prometheus/32/bin/prometheus --config.file=/var/snap/prometheus/32/prometheus.yml --storage.tsdb.path=/var/snap/prometheus/common

$ systemctl cat snap.prometheus.prometheus.service
# /etc/systemd/system/snap.prometheus.prometheus.service
[Unit]
# Auto-generated, DO NOT EDIT
Description=Service for snap application prometheus.prometheus
Requires=snap-prometheus-32.mount
Wants=network.target
After=snap-prometheus-32.mount network.target snapd.apparmor.service
X-Snappy=yes

[Service]
EnvironmentFile=-/etc/environment
ExecStart=/usr/bin/snap run prometheus
SyslogIdentifier=prometheus.prometheus
Restart=on-failure
WorkingDirectory=/var/snap/prometheus/32
TimeoutStopSec=900
Type=simple

[Install]
WantedBy=multi-user.target