No, a data protection impact assessment (DPIA) must always be carried out in the context of a specific processing activity. It is intended to evaluate the risks and effects of a specific processing activity and to identify suitable measures to mitigate the risks. Without a specific processing activity, there is no basis for a meaningful DPIA.
With caralegal, you also save yourself duplicate documentation at this point: Purposes, descriptions, personal data, etc. do not have to be created again within a data protection impact assessment.