Covered call margin

If I have covered calls like

buy future & sell above spot CE, then margin requirement for selling CE is very less bcoz I have it covered against future.

but I am holding shares in account & I try to sell above spot ce, then I am not getting advantage of that. Dont you think zerodha should reduce margin for that also if underlying shares are in holding with similar or higher qty.

Pledge the shares and then short above strike calls.