Hi @Anonymous ,
Could you please share a bit more about your scenario?
Do you want to embed a Power BI report into your app?
If you want to embed a Power BI report into your app, you need to create a report within your Power BI based on your SP List data source firstly, then pin the Report to a specific dashboard.
After that, within your app, add a Power BI tile control, then specify the workspace, dashboard and Tile from your Power BI, then the report would be displayed in your app.
Please check the following article for more details:
https://powerapps.microsoft.com/en-us/blog/power-bi-tile-in-powerapps/
https://www.inogic.com/blog/2019/09/integrating-powerapps-and-power-bi-to-build-multifaceted-apps/
In addition, I think it is not necessary to embed a Power BI report into your PowerApps app, instead, I think the Chart Graph controls (e.g. Column Chart, Line Chart, Pie Chart) within PowerApps could achieve your needs.
I have made a test on my side, please take a try with the following workaround:
Add a Column chart control within your app, set the Items property of the Column chart to following:
AddColumns(
GroupBy(
AddColumns(
Filter('Home Working Test', Requester.Email = User().Email && Status_Request.Value = "Approved"), /* <-- I think the Status_Request is a Choice column in your SP list */
"MonthOfYear",
Text(Date_For_Home_Working_Test, "mmmm")
),
"MonthOfYear",
"GroupData"
),
"Homeworking Days",
CountRows(GroupData)
)
Then set the Labels property within the Column chart to following:
MonthOfYear
set the Series property within the Column chart to following:
'Homeworking Days'

In addition, if you want to control above Column chart control visible through a Button, please consider take a try with the following workaround:
Add a button control, set the OnSelect property to following:
UpdateContext({ShowChart: !ShowChart})
set the Visible property of the CompositeColumnChart1 (which is a Group control, contains the Column chart control) to following:
ShowChart
Please consider take a try with above solution, check if the issue is solved.
Best regards,