Alas, Sierra Chart's DTC server does not support the export of Continuous Contracts, or any indicator for that matter.

I believe you do have two options:

1) Using Zorro, download all of the individual contracts' historical data and construct a continuous contract indicator from that data.

2) Maybe you can export Continuous bars directly from Sierra Chart to text/csv, and then convert it to t6 using a zorro script. I have not tried this yet.