Hi @Matt-BH ,
For SharePoint integration, you can use custom field cards along with Patch function OnSave/OnSuccess of the control. Please follow below steps:
1. Add two custom cards in SharePointForm1:

2. Copy the controls from the two default cards

3. Change OnSuccess of SharePointForm1:
Patch(SPListName,SharePointForm1.LastSubmit,{comments:"Concatenate inputs of controls in custom cards"});ResetForm(Self); RequestHide()
4. Set Display Mode of Comments Data Card Value to DisplayMode.View
5. Remove the two system Cards from SharePointForm1, save and publish.
Note:
This should only work for create new items, edit exists need use another edit form and link OnNew and OnEdit with different forms. The reason is on editing exists need to modify the saved comments.
Best regards,