Dynamic %HINT ORACLE in select query

Hi Experts,
I am trying to implement given below code with dynamic % hint oracle
      SELECT vbeln posnr uepos
         FROM vbap INTO TABLE i_vbap
         FOR ALL ENTRIES IN i_vbak
          WHERE vbeln EQ i_vbak-vbeln
            %_hints oracle '&max_in_blocking_factor 500&&max_blocking_factor 500&'.
I want value 500 dynamic,
So far I have tried
%hint oracle lv_oracle_string.
%hint oracle (lv_oracle_string).
WHERE (lv_oracle_string).     "where conditon with %_hints oracle '&max_in_blocking_factor 500&&max_blocking_factor 500&'.
Any other ideas?
Thanks in Advance

Samuel,
Thank you so much, whatever you mentioned, I have tried ealier, but it was giving me dump because of incorrect spacing in my string.
Given below sloved my problem.
CONCATENATE '''&max_in_blocking_factor ' lv_oracle '&&max_blocking_factor ' lv_oracle '&'''
          INTO lv_oracle_string RESPECTING BLANKS.
          SELECT vbeln posnr uepos
             FROM vbap INTO TABLE i_vbap
             FOR ALL ENTRIES IN i_vbak
             WHERE vbeln EQ i_vbak-vbeln
             %_hints oracle lv_oracle_string.
Thanks you so much again. You Rock

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Dynamic %HINT ORACLE in select query

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