Display reference field with multiple items on a single textbox.

I want to connect this reference field with multiple items to a single textbox in my page and make it displays “JP101 JP102 JP103”. But the textbox wouldn’t allow me to connect to the reference field. I supposed that required a code? I’d be appreciate if you can guide me to the solution. Thanks in advance.

Reference fields let you display data from different collections in the same element. You can display data from different collections using reference fields in:

Like in these examples.

You can also connect dropdowns to reference fields too.

Otherwise you can combine separate fields like here.