Can I add more VLANs (IoT, Management, etc.)?

Yes. Add a new VLAN interface, PVID on the corresponding ports, an entry in the bridge VLAN table, a DHCP server for the new network and separate firewall rules, following the pattern in this article.

More in the article: https://ntg.bg/en/blog/mikrotik-vlan-network-segmentation-behind-main-router