Krishna is indeed mentioned in Jain texts.

• In Jain literature, Krishna is listed as one of the 63 Salakapurushas (great beings) and is described in Harivamsa Purana and other Jain works. He is also treated as a Vasudeva (a heroic figure) in the Jain universal history. ( jainknowledge.com)
• In Svetambara tradition, older agamic narratives like the Antagadadasao (Antagata Dasao) contain Krishna’s biographical episodes within Jain cosmology. The Jain account often connects Krishna as a cousin of Neminatha (the 22nd Tirthankara) and places him within the Harivamsa tradition. ( jainknowledge.com)

Note: Digambara and Śvetāmbara traditions may present Krishna’s role with slight differences in detail, but both recognize him as part of Jain narrative history rather than as a central spiritual teacher like the Tirthankaras. For concise Jain viewpoints, you can read more here and here .