Generate missing rows using JOIN / CROSS JOIN - sql

Question

I have 3 tables which are used to fill dynamic from value.
The table is represented by schema below.
User can add as many rows as possible, and the rows are shown to end user by template from FormField table.
The data that is saved in FormValues are only for not null values and any values that missing are not saved.
Now the problem is I have to generate report as expected below.
I have tried various combination of join / cross join, but none of them works as expected.
I am able to achieve this in C# via loops, but not able to do the same via SQL Server.
Script attached for DB
USE [SampleDb]
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[FormTemplate](
[Id] [int] IDENTITY(1,1) NOT NULL,
[Name] [nvarchar](50) NOT NULL,
CONSTRAINT [PK_FormTemplate] PRIMARY KEY CLUSTERED
(
[Id] ASC
)
) ON [PRIMARY]
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[FormField](
[Id] [int] IDENTITY(1,1) NOT NULL,
[FormId] [int] NOT NULL,
[FieldName] [nvarchar](50) NULL,
[FieldType] [nvarchar](50) NULL,
CONSTRAINT [PK_FormField] PRIMARY KEY CLUSTERED
(
[Id] ASC
)
) ON [PRIMARY]
GO
/****** Object: Table [dbo].[FormTemplate] Script Date: 3/2/2020 10:10:22 PM ******/
/****** Object: Table [dbo].[FormValue] Script Date: 3/2/2020 10:10:22 PM ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[FormValue](
[FormId] [int] NOT NULL,
[FieldId] [int] NOT NULL,
[RowIndex] [int] NOT NULL,
[FormValue] [nvarchar](50) NULL,
CONSTRAINT [PK_FormValue] PRIMARY KEY CLUSTERED
(
[FormId] ASC,
[FieldId] ASC,
[RowIndex] ASC
)
) ON [PRIMARY]
GO
SET IDENTITY_INSERT [dbo].[FormField] ON
GO
INSERT [dbo].[FormField] ([Id], [FormId], [FieldName], [FieldType]) VALUES (1, 1, N'FirstName', N'string')
GO
INSERT [dbo].[FormField] ([Id], [FormId], [FieldName], [FieldType]) VALUES (2, 1, N'LastName', N'string')
GO
INSERT [dbo].[FormField] ([Id], [FormId], [FieldName], [FieldType]) VALUES (3, 1, N'Place', N'string')
GO
INSERT [dbo].[FormField] ([Id], [FormId], [FieldName], [FieldType]) VALUES (4, 1, N'age', N'int')
GO
INSERT [dbo].[FormField] ([Id], [FormId], [FieldName], [FieldType]) VALUES (5, 1, N'dob', N'date')
GO
SET IDENTITY_INSERT [dbo].[FormField] OFF
GO
SET IDENTITY_INSERT [dbo].[FormTemplate] ON
GO
INSERT [dbo].[FormTemplate] ([Id], [Name]) VALUES (1, N'Sample')
GO
SET IDENTITY_INSERT [dbo].[FormTemplate] OFF
GO
INSERT [dbo].[FormValue] ([FormId], [FieldId], [RowIndex], [FormValue]) VALUES (1, 1, 1, N'fname1')
GO
INSERT [dbo].[FormValue] ([FormId], [FieldId], [RowIndex], [FormValue]) VALUES (1, 2, 1, N'lname1')
GO
INSERT [dbo].[FormValue] ([FormId], [FieldId], [RowIndex], [FormValue]) VALUES (1, 2, 3, N'lname3')
GO
INSERT [dbo].[FormValue] ([FormId], [FieldId], [RowIndex], [FormValue]) VALUES (1, 4, 5, N'20')
GO
INSERT [dbo].[FormValue] ([FormId], [FieldId], [RowIndex], [FormValue]) VALUES (1, 5, 3, N'10/10/2020')
GO

Answer 1

This answers the original version of the question -- and then some. But I don't update answers to conform to evolving questions.
You seem to want cross joins on three "tables". The third needs to generate the rowindex values:
select f.id as formtemplateid, ff.id as formfieldid, v.rowindex,
fv.value
from formtemplate f cross join
formfield ff cross join
(values (1), (2), (3), (4), (5)) v(rowindex) left join
formvalues fv
on fv.formtemplateid = f.id and
fv.formfieldid = ff.id and
fv.rowindex = v.rowindex
order by f.id, ff.id, v.rowindex;
EDIT:
You can generate up to 100 numbers using a recursive CTE by doing:
with n as (
select 1 as n
union all
select n + 1
from n
where n < 10 -- "10" is however many you want
)
select n.n
from n;