How can I account for UK-paid self-employment taxes & foreign housing deduction in TurboTax Home & Business 2020?

I live in the UK and am trying to complete my joint taxes using TurboTax Home & Business 2020. My husband cannot exclude his income and has not paid UK taxes, but I can and have filed here. Apparently, I need to get a certificate from the UK government proving this. However, TurboTax doesn't seem to have a means of acknowledging that I am not required to pay US self-employment taxes (double taxation treaty) nor does it offer the foreign housing deduction, which is for self-employed people, as opposed to the foreign housing exclusion. 1. How can I find what I need in TurboTax?

2. Why don't they have this ability?

Thanks!