Well define what a good value is? Do you have meaningful examples. The good value I can think of is the title itself which is the best we've got. Different input would require manual input unfortunately.
---
description: some damn good description
---
is how it is done in Awestruct. For pure Asciidoc pages, the following should work but it does not. We need to fix Awestruct upstream.
:awestruct-description: some damn good description
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