Entity Framework 6 How to Map a UserDefined datatype property as varchar type column in DB

I have to map a Userdefined type Property as a Varchar Column Using EntityFramework 6. So I have an entity called EngineQuota :

'''

 [Table(EngineQuotas)]
    public partial class EngineQuota
    {
        public int Id { get; set; }
        
        public DecimalList Quotas { get; set; }

        public int? EngineId { get; set; }    

        private EngineQuotas()
        {
            this.Quotas = new DecimalList();
        }
    }

'''

The DecimalList is a seperate class which holds a sortedList of decimals '''

public class DecimalList : IEnumerable<decimal>
    {
        private readonly SortedSet<decimal> items;

        public DecimalList()
        {
            this.items = new SortedSet<decimal>();
        }

        public IEnumerator<decimal> GetEnumerator()
        {
            return this.items.GetEnumerator();
        }

        IEnumerator IEnumerable.GetEnumerator()
        {
            return this.GetEnumerator();
        }
 public override string ToString()
    {
        return string.Join(",", this.items.Select(n => n.ToString()).ToArray());             
    }
       
    }
}

''' In DB I want a comma seperated value of items in DecimalList to be stored in a Column Quota in Table EngineQuotas. How is this possible in Entity Framework6 . Tried Using ComplexType but not able to get some result

Edited For Awnser: As suggested by Quain. I created another property

1. public DecimalList DecimalListQuotas { get; set; } and Changed the Quotas property to type string to matchup with DB . The Quotas property is now using DecimalListQuotas internally for get set

e public string Quotas
    {
        get
        {
            return DecimalListQuotas.ToString();
        }
        private set
        {
            decimal[] nums = value.Split(',').Select(decimal.Parse).ToArray();
            this.DecimalListQuotas.AddRange(nums);
        }

    }