I think the input field should be "Other income subject to self-employment tax" as shown in the image below not just  "Other income" without paying social security and medicare tax. You circled the first one, but you were showing the second one, so which one do you mean?

I think it is the first one because if the income were added to the w-2, it is subject to social security and medicare tax which is pretty much the same as self-employment tax.

However without that, the predefined input field "Excess salary deferrals" and excess dependent care benefit (w-2 box 10) treatment just add to the income with paying social security and medicare taxes, so I do not know why, do you?