Hi @Saan ,
Just throwing out some ideas, not tested anything.
You could format the control text like Text(ThisItem.'To Date',"mm/yy").. Text(DateValue.SelectedDate,"mm/yy")
If you want a custom control then you could have two dropdowns with the items set to [01,02,03,04...] for months and then [19,20,21...] for the years you could probably even use an expression / collection to give you the current year and next couple.
You could then concatenate the values together when you update SharePoint with in the Update, or a Patch
Concatenate(dpdMonth,"/",dpdYear)
Regards,
Andrew