Hi, Tora Chan.
I think you can do it by using Update Records API as follows:
1.make button in header menu space.
2.when the button are pressed,open the dialog and input field code and value
3.using Update Records API
Add Buttons (Record List) https://developer.kintone.io/hc/en-us/articles/213149437/
Update Records API https://developer.kintone.io/hc/en-us/articles/213149027/
Just adding extra info to Masa’s answer -
Here’s the documentation