Unfortunately it is not possible to connect omni layer assets at this time.
What would be required, would be for someone to develop a wallet adapter for such assets.
In case you are interested, instructions for developing wallet adapters are here:
A wallet adapter is a PHP object that derives from a base class provided in the plugin. Its main jobs are to discover deposits for the plugin and to perform withdrawals at the request of the plugin.
Unfortunately I do not have time to develop an omni layer wallet adapter. Whenever I have time for development, I am working on a bitcoin lighning (lnd) adapter, and its natural continuation will probably be to connect to tarot assets. Only time will tell what I actually manage to develop, since everything is fluid right now. I have also been looking into the infura API for ERC-20 assets, but this requires significantly more work, mostly key management.
Hope this answers your question. Let me know if you have additional questions.