difficulties adding different error to each sample when only changing one variable

[fboschetty]

I'm attempting to add noise to one variable (H2O_Liq) using tb.add_noise_sample_1phase(). The problem is that I want to add a different error for each sample, rather than a fixed value for all samples as in the examples on read the docs (e.g., 5 rel% or 0.5 wt%)
I have tried providing a series, and list, to the variable_err parameter but there is a shape mismatch.
Having looked at the code I think implementing this functionality would require a bit of a rewrite, but I wanted to check I wasn't missing something obvious.

Thanks,

Felix