Omur,
Download the geodatabase from the Survey123 online portal and save to your desktop
Open the table/feature class in ArcMap, and run the "Table to Excel" Tool (I always check the "Use field alias as column header" and "use domain and subtype description" options)
Open the exported excel file and save as .xlsx
In word (or excel) create your report template. Leave text boxes for the places where you will fill in your data from the survey
When the template is complete, use the Mailings tab in word or excel to "select recipients" and "use existing List" and select your excel file (the .xlsx version)
Now you can insert the fields where you want them. Open the text box, and click the "Insert Merge Field" button to insert the field.
When all of the fields are linked with the correct place, you can "finish and merge" and each individual report will be filled in based on the survey data.
~Phil