fastapi - async download an excel file FileResponse - python-3.x

Question

I'm using a pre-filled Excel range to overwrite it with editpyxl. I saw that openpyxl and xlsxwriter are not able (yet) to keep shapes etc. in other sheets when another sheet is written.
And editpyxl takes a lot of time to write to the Excel range. However, it also blocks the application so I'm trying to make it asynchronous, but wasn't able yet as using await doesn't just work out of the box like magic..
from fastapi import FastAPI, Request
from fastapi.responses import FileResponse
import editpyxl
app = FastAPI()
temp_folder = "./_temp"
file_output_name = "output_fileresponse.xlsx"
#app.get("/my-projects/{project}/download-report", include_in_schema=False)
async def my_project(request: Request,
project: str, ):
report_template = Path(path, excel_file)
wb = editpyxl.Workbook()
wb.open(report_template)
ws = wb.active
def write_pd_to_xlsx(xlsx_range, pd_series):
ss = ws.cells_in_range(xlsx_range)
sc = df[pd_series]
zipped_lists = zip(ss, sc)
for xlsx_cell, pd_value in zipped_lists:
ws.cell(xlsx_cell).value = pd_value
total_records = 2000
ranges_excel_file = [f"C8:C{total_records + 7}", f"D8:D{total_records + 7}",
f"E8:E{total_records + 7}", f"F8:F{total_records + 7}",]
columns_to_use = ["Column 1", "Column 2", "Column 3", "Column 4"]
zipped_ranges_columns = zip(ranges_excel_file, columns_to_use)
for rng, col in zipped_ranges_columns:
write_pd_to_xlsx(rng, col)
wb.save(os.path.join(temp_folder, file_output_name))
response = FileResponse(os.path.join(temp_folder, file_output_name), filename=file_output_name)
wb.close()
return response