Rapidly selecting a choice in the auto-completion context menu in Eclipse

Is there any quick way select a choice in the auto-completion context menu in Eclipse?

For example, in the following screenshot, I would like to directly select and enter the fourth option, i.e. format_data. How can I do that with the keyboard without having to hit ↓ three times or type rmat_d? E.g., typing 4 instead (which doesn't work).

Currently, Eclipse does not offer any quick way to select a choice in the auto-completion context menu. The only option is using arrow keys.