Despite its importance for well-being, spiritual care remains under-explored in HCI, while the adoption of technology in clinical spiritual care lags behind other healthcare fields. Prior work derived a definition of "spiritual support" through co-design workshops with stakeholders in online health communities. This paper contributes: (1) a revision of that definition through member checking with professional spiritual care providers (SCPs); (2) a novel design framework—SPIRIT—which can help to expand models of delivery for spiritual care using digital technologies. Through re-analysis of previous data and new interviews with SCPs, we identify three prerequisites for meaningful spiritual care: openness to care, safe space, and the ability to discern and articulate spiritual needs. We also propose six design dimensions: loving presence, meaning-making, appropriate degree of technology use, location, degree of relational closeness, and temporality. We discuss how SPIRIT offers guidance for designing impactful digital spiritual care intervention systems within and beyond clinical settings.