Those interested in pneumatology in the Pastorals will be interested in a chapter in a recent volume:
Simmons, William A. The Holy Spirit in the New Testament: A Pentecostal Guide. Downers Grove, IL: IVP Academic, 2021. [note chap. 13: “The Holy Spirit in the Pastoral Epistles: The Spirit of Power, Love and Self-Control,” pp. 161–72]