Why wouldn’t you break this up into two different Things?
Asset Thing
Job Thing
Asset Thing has
a ID (if you need it to match with an external system, otherwise Bubble will manage unique ID’s for you as with any Thing)
Asset Name as Text
Jobs (List of Job Things relationship)
Job Thing has
Job #
User
Hours
of Asset (Asset Thing relationship, not a list)
Entering data would be a two step process: Creating or selecting the asset, then creating or selecting a job#, then adding hours (assuming the user is logged in you can use the created by data for the user)
Then you can easily create Repeating Group across all Assets, and for each you show all related jobs’ (or jobs :count as in your exampe) plus the sum of the jobs hours.