"Is there anyway to do this?"
Of course. But forcing pseudo-indices into structure fieldnames is much less efficient and more complex than simply using actual indices of a non-scalar structure. Using another cell array rather than a structure is probably the simplest and most efficient approach: a good rule of thumb is to keep data design as simple as reasonably possible.
Here I call NDGRID to demonstrate how it works, but of course you will call your own function:
A = {1:3,4:6,7:9} % example input cell array
C = A; % preallocate output cell array
[C{:}] = ndgrid(A{:}) % call function
Ah, very simple and very efficient code due to simpler data design.
Now with a structure array, also a reasonable approach:
S = struct('data',A); % preallocate structure array
[S.data] = ndgrid(A{:}) % call function
If you really want to follow your complex approach of hiding pseudo-indices in fieldnames, then CELL2STRUCT is one way (note how this just adds more complexity on top of simply using the cell array. You cannot avoid this because there is no comma-separated list syntax which allocates to different fields).
F = "A" + (1:numel(A));
inefficientDataDesign = cell2struct(C,F,2)
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