Hello team,
while working on #70627 in Kibana, I noticed that there is no option to configure the wording and overall display for when the input value doesn't match any existing options.

I think for the following use case, such an option would be very useful:

• The user can type in any value as a "wait for snapshot" policy name when configuring "Delete phase" on Index Lifecycle Policies page.
• The UI should be helpful in that it displays existing snapshot policies as options list.
• The user should not be blocked from typing in any value.

Currently, the UI displays a callout beyond the combobox but it seems like the callout and the "Hit ENTER ..." wording compete to say the same thing. The general "Hit ENTER ..." wording doesn't provide all the useful information though.