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Is it possible to alter the observation_date rather than realtime_date?

For example, on series UNRATE I'd like to just grab the last 12 months - but realtime_date wouldn't effect this selection:

realtime_start realtime_end        date value
0      2021-05-07   2021-05-07  1948-01-01   3.4
1      2021-05-07   2021-05-07  1948-02-01   3.8
2      2021-05-07   2021-05-07  1948-03-01   4.0
3      2021-05-07   2021-05-07  1948-04-01   3.9
4      2021-05-07   2021-05-07  1948-05-01   3.5
5      2021-05-07   2021-05-07  1948-06-01   3.6
6      2021-05-07   2021-05-07  1948-07-01   3.6
7      2021-05-07   2021-05-07  1948-08-01   3.9
8      2021-05-07   2021-05-07  1948-09-01   3.8
9      2021-05-07   2021-05-07  1948-10-01   3.7
10     2021-05-07   2021-05-07  1948-11-01   3.8
11     2021-05-07   2021-05-07  1948-12-01   4.0

Thank you!

When I run this line of code:
fred.get_series_df('GOLDPMGBD229NLBM')

I get the following error message:
No key 'observations' found, cannot make DataFrame

KeyError Traceback (most recent call last)
in
----> 1 df_gold = fred.get_series_df('GOLDPMGBD229NLBM')
2 df_gold

~\anaconda3\lib\site-packages\full_fred\series.py in get_series_df(self, series_id, realtime_start, realtime_end, limit, offset, sort_order, observation_start, observation_end, units, frequency, aggregation_method, output_type, vintage_dates)
339 e = "No key 'observations' found, cannot make DataFrame"
340 print(e)
--> 341 self.series_stack["get_series_df"].pop("observations")
342 self.series_stack["get_series_df"]["df"] = df
343 return self.series_stack["get_series_df"]["df"]

KeyError: 'observations'

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Hi, if you pay close attention to a FRED page like this:
https://fred.stlouisfed.org/series/GDPPOT
There is also some textual data attached to this time series about the Units, the Frequency, and a one line description, in the notes section. this part of data is also critical for the timeseries to be meaningful, but seemingly it is not accessible through this API.
Can you develop an integrated workaround please?