Isolate all computers except OMV

I am just trying to see if theres a way to make any computer that connects to the LAN to only see my media storage (OMV) and never any other computer on that network.
I was hoping there is a clever way to do this so I do not have to create a vlan each and every time I add a new computer to the network.

I know GLinet and some VPN programs have that "allow/disable local traffic" and was hoping there is a package maybe that does something close to that

I saw how you can at least isolate all devices with this post but its not exactly what I am going for.
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If the network is Wifi only, there is an option to isolate the clients.
If it is also wired, it get more difficult, as you would have to have a managed switch with capabilities to blocking arp packets.

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