Sending a struct with an array as an SSBO

I am working on a voxel engine in OpenGL and want a way to send my chunks to my shader

I know there are some really efficient methods and data structures out there to send voxels such as Sparse Voxel Octrees but I want to start simple, with only one chunk. In c++ chunk is defined as:

struct Chunk {
    alignas(4) int voxelNum;
    alignas(4) float voxelSize;
    alignas(4) float chunkSize;
    alignas(16) glm::vec4 position;
    bool grid[16 * 16];
};

The SSBO is like this in glsl:

struct Chunk {
    int voxelNum;
    float voxelSize;
    float chunkSize;
    vec4 position;
    bool grid[16 * 16];
};

layout (std140)  uniform ChunkData {
    Chunk chunk;
};

And the data is sent like this:

GLuint buffer;
glGenBuffers(1, &buffer);
glBindBuffer(GL_UNIFORM_BUFFER, buffer);
glBufferData(GL_UNIFORM_BUFFER, sizeof(Chunk), &chunk, GL_STATIC_DRAW);

I tested the code and this works great for all the variables up to the grid[] array. There, only the first element is correct.

How should I tackle this? More specifically, how can I send a single struct like this from my c++ code to the shader?