Can grubs eat jelly?

This is a sort of just wondering question, rather than a super serious one. 

My pachnoda marginata recently had a bunch of grubs, and I've mostly been giving them leaf litter and small fruit leftovers, I read online they can be fed crushed gammarus (and I assume daphnia as they tend to be smaller pieces) and it got me wondering - can they eat beetle jelly? I've googled it a couple of times with different terms, but never been able to find a concrete answer. 

I can't imagine it'd be detrimental to their health, but I could be wrong.  

 
They probably can, but are unlikely to unless it’s supplemented with high amounts of protein. Darkling beetle larvae will eat it, but they’re more generalist, so idk what others would

 
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