Um, I think it can :)

See https://metacpan.org/source/RSAVAGE/MarpaX-Demo-JSONParser-1.03/share/json.1.bnf and https://metacpan.org/source/RSAVAGE/MarpaX-Demo-JSONParser-1.03/share/json.2.bnf

no need to convert it to Regexp::Grammars format like the other examples

And the JSON bnf looks pretty pretty pretty similar to what you're trying to parse here

looks to be line; oriented ( ^ and ;$ )
parens ( ) don't look to span lines
leftstuff = rightstuff;
brackets [ ] span lines
braces { } span lines
keyname : somekindvalue ,
leftstuff rightstuff 
linestuff
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