Try this Link to New script:
tell application id "DNtp"
set newItem to create record with {name:"$title", type:markdown, plain text:"[$title]($user_link)"}
set refURL to reference URL of newItem
set itemPath to path of newItem
end tell
open location refURL
get refURL
$title is replaced with the title of the source document when the script runs
$user_link is replaced with a link to the source document.
so [$title]($user_link)
will be transformed into a markdown link to the source document. E.g. [DEVONthink script - Discussion & Help - Hook Productivity Forum](https://discourse.hookproductivity.com/t/devonthink-script/1242)
You can specify the plain text contents of a new record created with AppleScript, so
set newItem to create record with {name:"$title", type:markdown, plain text:"[$title]($user_link)"}
will create a new record with a markdown link to the source document, which, if I understand correctly, is what you’re trying to do.
Hope this helps!