I have to use Windows at work and my favourite application is Notepad++ (https://notepad-plus-plus.org/). A feature I really like – and miss in Drafts – is autocompletion for strings that are present in the file that is currently open.
Example
Plesiorycteropus, also known as the bibymalagasy or Malagasy aardvark, is a recently extinct genus of mammals from Madagascar.
When typing bib a pop-up appears for easy text completion to bibymalagasy. Similar functionality can be triggered by ctrl + nin Vim. I miss it badly in Drafts.
Not exactly the same, but perhaps a useful action that does essential what you described. Likely would be most useful if associated with a keyboard shortcut.
It should, how are you using it? You can up-down arrow to select from the suggestions and hit return to accept. Mac or iPad. That’s standard Drafts prompt behavior.
There is a list of entries if there are at least two proposals. If there is only one matching proposal, is is not a single entry in a “list”, but this one proposal appears on a button that looks like it can be triggered by pressing return. The only keys working here are esc and space (both make the dialog go away).