I have a Power BI report that shows Blank instead of zero
I wonder if there is any way ( through formatting or other tool) that can convert Blank to zero
without the use of new columns or measures.

I assume the two blank cards usually display a number value? The problem is that when an aggregation method like SUM summarizes blank or null rows, it returns (blank). There is, for as far as I know, no way to change this default behavior when working with the built in aggregations.
Although not optimal, a solution is with a separate measure. Simply add 0 to the expression
measure = SUM ( [Value] ) + 0
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