Comment 3 for bug 2037719

Netplan does not currently support that natively.

But it looks like you could have a systemd-networkd override config to you Netplan config, e.g.:

/etc/systemd/network/10-netplan-bond0.network.d/override.conf
```
[DHCPv4]
SendOption="81:string:it02.pak.com."

```

see https://www.freedesktop.org/software/systemd/man/latest/systemd.network.html#SendOption=
There are also the RequestOptions= and SendVendorOption= settings that look related.