How to add input field to woocommerce page?

Question

WordPress

I know that this question has already been raised, but only the wc fields factory was advised there, which does not work with my site (apparently the theme or plugins conflict)
Tell me, can I do it with hooks?
I found this method, but the data entered in the admin panel does not appear
The method is here

Answer 1

The link is a perfectly acceptable method. As for the admin panel, of course they won’t be there, because in the example at the link there is no code for the admin panel. It needs to be written additionally.

Answer 2

Well, there, according to your method link, it is not described that it will be in the admin panel.
If you want to see it also in the admin panel, then you need to add the display and save code.
Search in the search engine - adding fields to the admin panel