Generated compile_commands.json of Qt Creator 4.9-beta1 not loadable by Sourcetrail (worked with 4.8)

Sourcetrail is a very cool cross-platform source explorer for C/C++.

There is a Qt Creator plugin to support Sourcetrail, but it can also load a compile_commands.json which Qt Creator is able to generate since 4.8.
Sourcetrail is able to load the 4.8 version of compile_commands.json but unfortunately not the 4.9-beta1 version.

compile_commands.json (4.8.0):

[
{
    "arguments": [
        "clang++",
        "-c",
        "-m32",
        "-target",
        "i686-pc-windows-msvc",
...

compile_commands.json (4.9-beta1):

[
{
    "arguments": [
        "clang++",
        "--driver-mode=cl",
        "-nologo",
        "-Zc:wchar_t",
        "-FS",

The difference seems to be the --driver-mode=cl entry introduced in 4.9.

This is the error message in Sourcetrail:

I created a Sourcetrail task.

Let's assume that both variants of the compile_commands.json are valid. Would it be possible to have some user options for generating the file? Either when generating or global? I could think of choice of:

• "arguments" lists vs. "command" value
• driver mode
• Filename (with current path as default)