So many different issues involved here…
The inline relays will NOT work. Only use them for the voltages they are certified for, or you can start a fire.
The hub itself is like many consumer appliances, and can probably use a transformer. But check with support@smartthings.com to be sure.
Zwave is controlled but not licensed spectrum. Which means that in different countries, different frequencies are reserved for things like the walkie talkies that emergency services use, or mobile phones, etc. It is illegal in some countries to use US zwave frequencies. So before you plug in ANYTHING, including the SmartThings hub, that uses US zwave frequencies, check to make sure that doing so is legal in your area.
(The ST hub currently sold is US frequency only, and consequently can only talk to zwave devices that use the same frequency. There were a very few manufactured with the European frequency for original kickstarter backers. There has been some talk that they may add other frequency models in the future, but not now.)
See more frequency discussion here:
So…
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First check that US zwave frequencies are legal in your country. If not, you will need to return the hub and hope for future options.
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If US zwave frequencies ARE legal in your country, you can probably use the ST hub you just bought as it has a USB connector, but only to talk to zwave devices that are also on the US frequency. And finding those with 220v is very difficult. There are a few made for the South American market, and a few made for some of the Asian countries with the same set up. (Singapore?) But read carefully. Try writing to Aeon Labs (Aeotec) and see what they have, they’re trying to reach a lot of markets.
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Transformers will only work for devices which draw power, NOT for devices which control power. So may work for things that plug in. But will not work for light switches, relays, motor controls, etc.