Show automounted SSH in Nautilus

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I have a NAS. Normally I use a Bookmark Link to Access it. (Since I use Linux I never used SMB for connection. )
Now I have the need for an automounted sftp, so It should be available directly after Login. Cause is an Application which I need to have access to Files there. This mounted ssh should also auto-reconnect if the network connection is lost.

At moment, I play around with systemd mount.

that’s my current settings that not work:
~/.local/share/systemd/user/media-USER-sshmount.automount
[Unit]
Description=Auto Speicher einbinden

[Install]
WantedBy=user.target

[Automount]
Where=/media/USER/sshmount

~/.local/share/systemd/user/media-michel-sieben.mount
[Unit]
Description=Speicher sshmount einbinden

[Install]
WantedBy=user.target

[Mount]
What=USER@NAS.local:/
Where=/media/USER/sshmount
Type=fuse.sshfs
Options=_netdev,allow_other,IdentityFile=/home/USER/.ssh/USER-lp,reconnect,ServerAliveInterval=15,ServerAliveCountMax=10,uid=1000,gid=1000
TimeoutSec=60

Error journalctl -xe
Feb 24 10:23:12 USER-lp systemd[1815]: media-USER-sshmount.automount: Failed to initialize automounter: Operation not permitted
Feb 24 10:23:12 USER-lp systemd[1815]: media-USER-sshmount.automount: Failed with result ‘resources’.
░░ Subject: Unit failed
░░ Defined-By: systemd
░░ Support: http://www.ubuntu.com/support
░░
░░ The unit UNIT has entered the ‘failed’ state with result ‘resources’.
Feb 24 10:23:12 USER-lp systemd[1815]: Failed to set up automount Auto Speicher sshmount einbinden.
░░ Subject: A start job for unit UNIT has failed
░░ Defined-By: systemd
░░ Support: http://www.ubuntu.com/support
░░
░░ A start job for unit UNIT has finished with a failure.
░░
░░ The job identifier is 3105 and the job result is failed.

My currently partly working script in ~/.config/autostart/sshmount.desktop I wish to replace:
#!/bin/bash

DIR="/media/$USER/sshmount/"
if [ ! -d "$DIR" ]; then
  ### Take action if $DIR not exists ###
  pkexec mkdir ${DIR}
else
umount $DIR
umount $DIR
fi

if [ ! "$(stat -c '%U' ${DIR})" == "$USER" ]; then
  pkexec chown -Rh $USER:$USER $DIR
else
echo $DIR
fi

if [ ! "$(stat -c '%U' ${DIR})" == "$USER" ]; then
echo "Rechtefehler!"
pause
else
echo $(stat -c '%U' ${DIR}) ; echo $USER
fi
sshfs sshmount:/ ${DIR} -o idmap=user -o uid=$(id -u) -o gid=$(id -g) -o follow_symlinks
afuse -o mount_template="sshfs %r:/ %m" -o unmount_template="fusermount -u -z %m" ${DIR}