raylib - input attribute to vertex shader

I have simple vertex shader

#version 330 core
in vec4 vertexPosition;
in vec4 vertexColor;
out vec4 v_color;
uniform mat4 mvp;

void main()
{
    v_color = vertexColor;
    gl_Position =  mvp * vertexPosition;
}

and I call it using

BeginShaderMode(simpleShader);
 DrawTriangleFan(vertices, vertexNum, RED);
EndShaderMode();

Now i need one more input attribute to scale vertexColor. I can't use uniform, because it's not per-vertex. Should i use VBO somehow?