Ignition Hand Files to GTOBase?

I just started playing online a few months ago. I've been using ignition because I saw people recommend it on reddit. Now I think that might've been a mistake because I'm seeing some evidence that their hand file format isn't great.

I tried importing some hands into gtobase because that one's free as far as I can tell. But it said format not supported.

My experience with converters and file formats is pretty vast and I've written many of them myself. I'm a software dev & data engineer by trade. But I can't seem to find any documentation on these formats. Is there any way I can convert these files or find out the exact format to write a converter myself? Or should I call my losses and pivot to a different online poker site (and if so which one)