DECLARE @SQL nvarchar(max) =
    N'
    DECLARE @T AS table (c1 integer NOT NULL);

    WITH CTE (c1) AS
    (
        SELECT V.v
        FROM
        (
            VALUES
                !list!
        ) AS V(v)
    )
    INSERT @T (c1)
    SELECT c1
    FROM CTE;
    ';

SET @SQL =
    REPLACE
    (
        @SQL,
        N'!list!',
        (
            SELECT
                STRING_AGG
                (
                    CONVERT
                    (
                        nvarchar(max),
                        CONCAT(N'(', GS.[value], N')')