Eloquent: Query the length of field in Laravel

I want to do something like that in Laravel (valid sqlite query):

select * from 'tbUsers' where  length(name)>50;

I tried

User::with('Permissons')->where('LENGTH(name)','>','50')->get();

But it seems not to work...

note: other queries works without problem:

User::with('Permissons')->where('active,'=','1')->get();

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