after seeking several blogs, I'm still searching for a cli command with does same as GUI right-click on tape device, scan and option eject.
Only command I found, which ejects tape is omnimver -device "<devicename>" -eject, which takes quite a bit of time verifying tape.
We cannot create a second tape due to license limitations and it's a single drive, not a library/changer. For we have several backup jobs, so it's also not possible to check eject after backup in device.
Thanks and regards.