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This script is an example of setting the color from code. Is this along this lines of what you're looking for?

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using RaymarchingToolkit;
[RequireComponent(typeof(RaymarchObject))]
[ExecuteInEditMode]
public class ColorInput : MonoBehaviour
{
    RaymarchObject obj;
    public string InputName;
    public Color ColorValue;
    void Start()
    {
        obj = GetComponent<RaymarchObject>();
    }
    void Update()
    {
        var input = obj.GetMaterialInput(InputName);
        if (input != null) {
            input.color = ColorValue;
        }
    }
}