Digital nomad working for an employer in NJ, considering establishing domicile in South Dakota

Hello,

I have been travelling full-time for over a year and have spent very little time in NJ.

If I establish domicile in South Dakota (no income tax) I will have to file a nonresident return to NJ. On this form, column A reports total income and column B reports "NJ-source Income"

I have seen conflicting definitions on NJ-source income.

Would it be appropriate to report NJ-source income as income earned while physically working in NJ?

Or is income from a NJ based employer NJ-source on its own?

Any help will be greatly appreciated.