You can't do it as part of the style but you can do it with a find and replace.

First create the content you want to add (eg the Picture placeholder)
Select that placeholder and the trailing paragraph mark and cut it (to get it into your clipboard.
Now open the Find and Replace dialog
Find: ^p and include the Format>Style>Heading 1
Replace with: ^&^c

This will find the paragraph mark at the end of all Heading 1s and replace it with itself plus your clipboard contents.

I see Paul got in first and suggested the same thing...

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Andrew Lockton
Chrysalis Design, Melbourne Australia