如何创建具有条件限制的策略Postgres？

问：

之前我制定了能够获取所有数据的角色的策略，但我不希望他们获取所有数据，所以我想通过限制来限制它们

我以前的政策是这样的

CREATE POLICY "Account profiles are viewable by himself."
    ON public.accounts
    AS PERMISSIVE
    FOR SELECT
    TO anon, authenticated, cms-admin
    USING (true);

当我尝试这样时：

CREATE POLICY "Account profiles are viewable by himself."
    ON public.accounts
    AS PERMISSIVE
    FOR SELECT
    TO anon, authenticated, cms-admin
    USING (LIMIT 5);

我收到错误：

ERROR:  syntax error at or near "LIMIT"
LINE 7:  WITH CHECK (LIMIT 5);
                     ^ 

SQL state: 42601
Character: 172

我也想使用这个条件策略

ORDER BY id DESC
LIMIT CASE WHEN current_setting('role', true)::text IN (anon, authenticated) THEN 1 END;

是否可以在策略上运行上述条件？