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Set custom bin sizes in histogram

I have some data from a dataframe column that I am trying to put into a histogram in custom bin sizes, that are static - not dynamically generated based on the data.

The data are minutes. Here is an example (with index):

0 6.966667
1 29.716667
2 24.516667
3 29.833333
6 21.533333
7 11.916667
8 18.816667
9 23.533333
10 21.466667
11 11.550000
12 17.200000
13 27.216667
14 21.533333

The bin sizes will always be: (0-15], (15-30], (30-45], (45-60], (60-75], 75+

I am having trouble finding how I can set up my histogram bins to categorize the data this way. I have read through all the documentation I can find, and the help pages and not quite finding what I need.

This is some of my code, but it still creates only 2 bins:

import plotly.graph_objects as go
from plotly.subplots import make_subplots

fig = make_subplots(rows=1, cols=2)
trace0 = go.Histogram(x=df[col_name], xbins=dict(
trace1 = go.Histogram(x=df[col_name], nbinsx=6)
fig.append_trace(trace0, 1, 1)
fig.append_trace(trace1, 1, 2)


I was looking at possibly setting up a frequency table and then using a bar chart off of that, but I like the overlay feature of the histograms so would like to stay in that part of the library if possible.

Thank you!