How can we create non-clustered index on table variable?

Create Table @risk (rskid int)

Create nonclustered index r_rskid_nc on @risk(rskid)

It does not work??

My proc

How can i optimize it?

ALTER PROCEDURE [dbo].[SPR_LV004]
(
 @TopN INT
,@LoggedUserId INT
,@Entity VARCHAR(255)
,@OpModel VARCHAR(255)
,@RiskCat VARCHAR(255)
,@RsdlInh VARCHAR(1)
,@DisplayAction VARCHAR(1)
,@LastAssDate DATETIME
)
AS 

SET NOCOUNT ON
        
DECLARE @Thisdate DATETIME
        
SET @ThisDate = GETDATE()

DECLARE @MainFilter  TABLE(
            fcaName VARCHAR(100)
           ,fctName VARCHAR(100)
           ,rskId INT PRIMARY KEY CLUSTERED )

DECLARE @Tgt  TABLE(rasRiskId INT
           ,rasId INT
           ,RAMName VARCHAR(100)
           ,RAMColour INT
           ,RAMImpDesc VARCHAR(100)
           ,RAMLikDesc VARCHAR(100)
           ,RAMImpScore INT
           ,RAMLikScore INT
            ,LastScore INT
            ,AnnualExposure NUMERIC(15, 0)
            ,Currency VARCHAR(9)
            ,OverallExp NUMERIC(15,0)
            ,Frequency INT
            ,LastAssessmentDate DATETIME)

DECLARE @Inh  TABLE(rasRiskId INT
           ,rasId INT
           ,RAMName VARCHAR(100)
           ,RAMColour INT
           ,RAMImpDesc VARCHAR(100)
           ,RAMLikDesc VARCHAR(100)
           ,RAMImpScore INT
           ,RAMLikScore INT
            ,LastScore INT
            ,AnnualExposure NUMERIC(15, 0)
            ,Currency VARCHAR(9)
            ,OverallExp NUMERIC(15,0)
            ,Frequency INT
            ,LastAssessmentDate DATETIME)

DECLARE @Res  TABLE(rasRiskId INT
            ,rasId INT
            ,RAMName VARCHAR(100)
            ,RAMColour INT
            ,RAMimpDesc VARCHAR(100)
            ,RAMlikDesc VARCHAR(100)
            ,RAMImpScore INT
            ,RAMLikScore INT
            ,LastScore INT
            ,AnnualExposure NUMERIC(15, 0)
t-sql sql-server-2005
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