Notification for missed messages

A clear and concise description of what the problem is:

When I log into my computer and element starts (through autostart with "--hidden" argument), I don't get notifications for
messages that have been sent to me while my computer was turned off. I will not know if anyone wrote messages to me,
unless I start the app and look at the window.

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A clear and concise description of what I want to happen:

I want to get a notification with the total number of missed messages (from rooms that have notifications turned on),
when element starts (--hidden) after logging into my computer. I want to be able to turn this feature on and off
using a toggle-button somewhere in settings.

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A clear and concise description of any alternative solutions or features I've considered:

- Write my own program. (Problem: I am not good at that)
- Using a phone to stay in touch with people. (Problem: Phones are terrible)
- Starting the app manually and check the window for missed messages. (Problem: I forget doing that)
- Autostart the app on login (not --hidden) and check the window for missed messages. (Problem: It's annoying)

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Any other context or screenshots about the feature request:

- This is my first feature-request on github.
- I am using element-desktop version 1.7.29 (flatpak) on LinuxMint 19.2 Cinnamon.