Create Field.md

Create WFFM field in Sitecore under /sitecore/system/Modules/Web Forms for Marketers/Settings/Field Types. For example:

• Item Path: /sitecore/system/Modules/Web Forms for Marketers/Settings/Field Types/Custom/Label
• Template: /sitecore/templates/Web Forms for Marketers/Field Type
• Assembly: MyProject.CMS.Custom
• Class: MyProject.CMS.Custom.WFFM.Fields.Label
• MVC Type: MyProject.CMS.Custom.WFFM.Fields.LabelField, MyProject.CMS.Custom

Label.cs

using System;
using System.ComponentModel;
using Sitecore.Form.Core.Attributes;
using Sitecore.Form.Core.Visual;
using Sitecore.WFFM.Abstractions.Actions;

namespace MyProject.CMS.Custom.WFFM.Fields
{
    public class Label : Sitecore.Form.Web.UI.Controls.CssClassControl
    {
        private string _htmlText;
        private string _value = String.Empty;
        
        [VisualCategory("Appearance")]
        [VisualProperty("Field Text (HTML):", 100)]
        [VisualFieldType(typeof(TextAreaField))]
        [Localize]
        public string HtmlText
        {
            get
            {
                return !string.IsNullOrEmpty(_htmlText) ? _htmlText : this.Title;
            }
            set
            {
                _htmlText = value;
            }
        }

        [Description("Title")]
        [Bindable(true)]
        public string Title { get; set; }
        
        public override ControlResult Result
        {
            get
            {
                return new ControlResult(this.ControlName, (object)String.Empty, (string)null);
            }
            set { _value = String.Empty; }
        }
    }
}

LabelField.cs

using System;
using System.ComponentModel;
using Sitecore.Forms.Mvc.Interfaces;
using Sitecore.Forms.Mvc.ViewModels;
using Sitecore.WFFM.Abstractions.Actions;

namespace MyProject.CMS.Custom.WFFM.Fields
{
    public class LabelField : FieldViewModel, IFieldResult, IContainerMetadata
    {
        public string HtmlText { get; set; }

        public string Text
        {
            get
            {
                return !string.IsNullOrEmpty(HtmlText) ? HtmlText : base.Title;
            }
            set
            {
                HtmlText = value;
            }
        }

        [DefaultValue("")]
        public virtual string Value { get; set; }

        public string ResultParameters { get; set; }

        public virtual ControlResult GetResult()
        {
            return new ControlResult(this.FieldItemId, this.Name, (object)String.Empty, this.ResultParameters, false);
        }
    }
}

LabelField.cshtml

@using Sitecore.Forms.Mvc.Html
@model MyProject.CMS.Custom.WFFM.Fields.LabelField

@using (Html.BeginField())
{
    @Html.BootstrapText("Text")
}