How can I construct a unique_ptr pointing to a vector with single element conveniently?

I would like to construct a unique_ptr holding a vector<string>, which contains single element only. Is it possible to do this in single line of code? I try this approach:

auto values = make_unique<vector<string>>({value});

But compiler (clang++) complains:

No matching function for call to 'make_unique' candidate template ignored: 
substitution failure [with _Tp = std::__1::vector<std::__1::basic_string<char>, std::__1::allocator<std::__1::basic_string<char> > >]: no type named '__unique_array_unknown_bound' in 'std::__1::__unique_if<st... candidate template ignored: substitution failure [with _Tp = std::__1::vector<std::__1::basic_string<char>, std::__1::allocator<std::__1::basic_string<char> > >]: no type named '__unique_array_known_bound' in 'std::__1::__unique_if<std:... candidate function [with _Tp = std::__1::vector<std::__1::basic_string<char>, std::__1::allocator<std::__1::basic_string<char> > >, _Args = <>] not viable: requires 0 arguments, but 1 was provided

I don't understand why it doesn't work since vector apparently accepts using initializer_list for construction.

string value = ...;
auto values = vector<string>({value}); // this works

Is creating a unique_ptr<vector<string>> and calling its push_back the only viable approach for constructing such a unique_ptr?

auto values = make_unique<vector<string>>();
values->push_back(value);

More broadly, if I have a fixed number of elements (for example, 3 elements), and would like to build a unique_ptr holding a vector with these elements, what is the idiomatic way to do it?