Link single text fields to API (not full lists)

Hi, sorry if this question sounds nooby, i just started today and fail to find a solution for this:

i created a link to an external API/connection. It works fine for lists but i struggle to connect single text fields to an external source. Like i want to control the Headline via that source. But when i try to connect the text field, Adalo doesn`t allow me to link it to that source and when i transform that text field into a list, i have multiple, unwanted list entries and the list takes more space from the viewport than expected.

Hope it is clear. Let me know if not.
Thanks for your help!