It is possible to create a link in a Listview column.
Here is an example where we use the custom variable _ASSETID. AssetID is an ID corresponding to an ID in a asset database.
Add the following to the host column or service column under My Account which is accessed by clicking on your name in the upper-right corner.
default, "Asset ID" = "<a href=\"http://inventory.example.org/?asset=" + custom_variables.ASSETID + "\">Asset " + custom_variables.ASSETID + "</a>"