I was thinking in terms of highly paid professional self employed people, who can work anywhere. In DD's last job, she had colleagues who lived in Italy, Estonia, Scotland
and who came into the office once a month for a couple of days. All spoke fluent and nearly accentless English and had studied or lived in this country at some point. The work they did was self contained. They might need to consult and talk to work colleagues, but the work was done, in their time to their pace providing they met all the deadlines.
For different reasons, DH has been working for a Danish company as a consultant for nearly ten years. By the time COVID came, visits to the company's office in Denmark and Germany had already almost ceased because of the ease of video conferencing. Now we have Zoom and Teams and it is even easier.