After you have both items as below, you can put the cursor at the end of the first item and hit shift-Enter. I did that with the second and added new text in between while retaining the same numbers. You can add text or images age you please. This will work for bullets as well as numbered items.
before
after
Just to confirm Sandy's answer, soft returns are the only way I know of to handle this. I tried hard-coding the starting number in the page source, but that information is stripped when the page is saved. You might be able to reset the numbering with a user macro.
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