Hello!
I think that what you are looking to do is modify the hovertemplate of your figure. The documentation for this can be found at Hover Text and Formatting | Python | Plotly.
Here is a code snippet for you:
import plotly.express as px
data_canada = px.data.gapminder().query("country == 'Canada'")
data_canada['idontwannaseethisone'] = 'i DONT wanna see this one'
data_canada['iwannaseethisone'] = 'i wanna see this one'
fig = px.bar(data_canada, x='year', y='pop', hover_data=['iwannaseethisone'], text= 'idontwannaseethisone')
fig.update_traces(hovertemplate='pop=%{y}<br>iwannaseethisone=%{customdata[0]}')
fig.show()
