Bokeh google maps, with labels, patches and circles.

gmap_labelset.py

from bokeh.io import output_file, show
from bokeh.models import (
  GMapPlot, GMapOptions, ColumnDataSource, Circle,Patches, LabelSet, HoverTool,
  TapTool,Range1d, PanTool, WheelZoomTool, BoxSelectTool,OpenURL
)

map_options = GMapOptions(lat=30.29, lng=-97.73, map_type="roadmap", zoom=11)

plot = GMapPlot(x_range=Range1d(), y_range=Range1d(), map_options=map_options,tools=[HoverTool(),TapTool()])
plot.title.text = "Austin"

# For GMaps to function, Google requires you obtain and enable an API key:
#
#     https://developers.google.com/maps/documentation/javascript/get-api-key
#
# Replace the value below with your personal API key:
plot.api_key = "api_key"

source = ColumnDataSource(
    data=dict(
        lat=[30.29, 30.20, 30.29],
        lon=[-97.70, -97.74, -97.78],
        names=['a-label','b-label','c-label']
    )
)
    
source2 = ColumnDataSource(
    data=dict(
        lat=[[30.29, 30.20, 30.29],[30.39, 30.29, 30.39]],
        lon=[[-97.70, -97.74, -97.78],[-97.70, -97.74, -97.78]],
        urls=['https://www.amazon.com','https://www.google.com']
    )
)

circle = Circle(x="lon", y="lat", size=15, fill_color="blue", fill_alpha=0.8, line_color=None)
plot.add_glyph(source, circle)

patch = Patches(xs="lon", ys="lat", fill_color="blue", fill_alpha=0.8, line_color=None)

plot.add_glyph(source2, patch)

# renders - patch added second so assuming patch renderer is the second element
rends = plot.renderers
# define glyph to appear on hover
patch_hov = Patches(xs="lon", ys="lat", fill_color="green", fill_alpha=0.8, line_color=None)
# set hover glyph
rends[1].hover_glyph = patch_hov

# set taptool callback
taptool = plot.select(type=TapTool)
taptool.callback = OpenURL(url='@urls')

labels = LabelSet(x='lon', y='lat', text='names', level='glyph',
              x_offset=5, y_offset=5, source=source, render_mode='canvas')

plot.add_layout(labels)

plot.add_tools(PanTool(), WheelZoomTool(), BoxSelectTool())
output_file("gmap_plot.html")
show(plot)

I have 0.12.13. So, your code works, but when I try do it in my code (link - https://gist.github.com/nitinsaroha/a55e28688fb56915950760ef74b0ea27 ) it doesn't. Here is the image of how it looks.
I have a tool tip also which shows some data for each region or patch.

I cannot reproduce the example you have shown me above, since I do not have access to the input data. However on a brief inspection you have defined two datasources; source and source1. The x and y fields of both of those are the same objects, and since the patches are working I am assuming you have put in lists of lists?

That works for patches, however the labelset needs specific points as in the example above - you need to calculate the center of each polygon and associate that with the specific label.