How to make LLDB pretty print?

Question

When I debug a C++ program in Neovim, the variables look like this

which seems too messy. I expect it to look like this:

I found LLDB using variable formatting to custom display options for variables. I tried using some scripts, such as:

• libcxx.py, and
• gnu_libstdcpp.py

but these didn't work for me.