Accessing data in packages after loading model

[wkitlasten]

I am struggling to access and manipulate data from a gwf model. In this specific case the GHB data is stored as an external file. I load the model in flopy:

gwf = sim.get_model(model)

But I am having difficulting figuring out how to access the data. An example of what I tried is:

gwf.ghb.data_list
Out[23]: 
[,
 ,
 ,
 ,
 ,
 ,
 ,
 ,
 ,
 {internal}
 (11464),
 ]

Does the {internal} suggest the data is not set to external? Because the .ghb file suggests otherwise:

# File generated by Flopy version 3.3.5 on 07/08/2022 at 13:33:20.
BEGIN options
END options

BEGIN dimensions
  MAXBOUND  11464
END dimensions

BEGIN period  1
    OPEN/CLOSE  'w_1000_10m.ghb_coast.dat'
END period  1

Is there a method to access the data?

Alternatively, is there a method that returns the external filename, which I can load myself (e.g., in pandas)?

Thanks