This is highly recommended for players wanting more depth. It adds numerous heart events and unique dialogue that flesh out Jas's personality and her relationship with the player without changing her age or status.
The famous Looking for Love mod series traditionally focuses on the "non-marriageable" adults like Sandy, Wizard, and Linus. However, a fan-fork exists: stardew valley jas marriage mod best
: New custom events at 2, 4, 6, 8, and 10 hearts. This is highly recommended for players wanting more depth
(References would list SMAPI documentation, Stardew Valley canon sources, community forum guidelines, and mod-hosting platform policies; omitted here.) and Linus. However
: This mod adds a quest to repair the town's school, giving Jas and Vincent a dedicated place to learn with Penny, which fleshes out her character arc significantly. Immersive Characters - Shane