Synology offer DNS Server package:
https://www.synology.com/en-global/dsm/packages/DNSServer
You can configure it for local resolution and let it forward everything else to an external DNS (e.g.: your provider DNS)
https://robpickering.com/configuring-synology-for-forward-and-reverse-internal-dns-resolution/
In the master zone you can add many entries you need that resolve your hosts and point to NAS IP:
diskstation.local -> your NAS IP
laura.local -> your NAS IP
Remember also to configure the router or the server that offering DHCP in your local network in order to provide your Synology NAS as DNS server.
In this way you don't need to create a host entry in each device in your local network