@Borgiz I assume you are using the Built-In Render Pipeline, right? In general please always describe your project setup such as the spine-unity version (name of the unitypackage), render pipeline, and similar when asking on the forum.
The "Spine/Sprite/Vertex Lit"
shader provides a color parameter next to the Albedo
texture parameter which acts as a tint color multiplier.
There is also a Color Adjustment
parameter, when enabled you can set the Overlay Color
parameter immediately below it. The Overlay Color
alpha value determines the blend intensity of the Overlay Color
(0=no color overlay, 1=full color overlay).
If this is not what you want, please describe your problem in more detail.