Ability to rotate the y-axis title in bokeh

I am trying to rotate the axis tittle of the yaxis of a bokeh figure. I cannot seem to find an option for this. Happy if anyone got a solution. I am actually in need to have this workig into holoviews/hvplot using the bokeh backend, but have not found a way supporting this.

What have you tried that did NOT work as expected?
I have tried to modify the major_label_orientation, but that is the labels for the major ticks.

Code example for jupyter notebook:

# Imports
import bokeh
import pandas as pd
import numpy as np
from bokeh.plotting import figure, ColumnDataSource, show, output_notebook
output_notebook()

# Create dummy data
xs = np.linspace(10,20, 11)
ys = np.random.random(len(xs)).cumsum()

data = {
    'x': xs, 
    'y': ys
        }
data
df = pd.DataFrame(data)
source = ColumnDataSource(df)

# Make plot
p = figure(frame_height=40, width=700)
p.line(x='x', y='y', line_width=2, source=source)
p.yaxis.axis_label = 'long label that would like to be rotated'

show(p)

In some cases, a screenshot of your plot will also be helpful.
If I have a long axis title I have issues fitting it. Would be nice if possible to rotate or wrap it.

Searching for an option like ‘p.yaxis.axis_label_orientation’

Happy to learn a good trick on this.

Bokeh axis labels do not support rotation, they are always parallel to their axis. You could put a Div to the left of the plot, and use that as a kind of axis label.

Thanks @Bryan I will add an issue for this as it has been a reappearing need both to rotate x axis labels vertically (if I have a slim vertically elongated plots) as well as to rotate yaxis labels horizontally if I have slim laterally elongated plots with long label names.

I just added this issue. Hope the suggestion could be seen as something that could serve more people and thus maybe be added in time.

Developers have swiftly added this feature, see pull request 13044, thanks a lot to those involved!
Setting this as solved given the enhancement.