Extract tables in structured format

Hello!

As far as I understand, science-parse extracts metadata and raw text from articles. However I would like to get also structured information from tables, for example json-like format
```
[['dataset', 'model', 'metrics'], ['MNIST', 'CNN', '0.98'], ...]
```

I understand that sometimes there are difficult-to-extract tables, e. g. when some rows/column are shared. However, I believe that in simplest case, this can be done quite easily.

Any ideas?