Text In Church allows you to add a "Custom Comment Field" to DCC form to collect any additional information relating to an individual Group.
To set up your Custom Comment Field you need to go to Groups and select the group you want to turn this on for. Under the Group Settings tab you will need to click the pencil icon in the top right to open up the editing options.
Then you will want to select the toggle button to turn on the Custom Comment Field. You can enter in the description of what you want to collect.
Make sure you click Save Group at the bottom when finished.
Submissions in this field will be formatted and added to the Comments field of the person.