You want to work with Marketing Attributes using Lead Surveys but you do not seem to find a way to achieve this in the system. You may have saw similar possibilities in SAP CRM OnPremise.
SAP Hybris Cloud for Customer
This is the current expected system behavior. The functionality of working with Marketing Attributes via Lead Surveys is planned to be made available in a later release. At this point in time, however, we are not in a position to provide more accurate information on date and/or timelines for this future release.
Survey ; Lead ; Marketing Attributes ; , KBA , LOD-LE-SUR-DEF , Survey definition = design time , LOD-CRM-LM , Lead Management , How To