Do you need exactly Option 82 functionality? I think, you may use 'Agent Circuit ID' and 'Agent Remote ID' fields of DHCP Lease. A few moments:
1) you should use Option82-enabled switches, and setup switch as DHCP Relay for RouterOS;
2) generally, 'Agent * ID' are binary fields in switches (see picture, switches are D-Link DES-3028), and I don't know whether you can manage them on RouterOS directly. we do not have troubles because we use RADUIS server for DHCP, but you may need a feature request to display/edit HEX, not RAW data in WinBox/CLI
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