Hi @mochabits,
I believe that you can achieve your goal using powerapps and sql. The basics would use the GroupBy() function along with sort and filter. I was able to construct the following app using the data you provided.
This screen contains 2 galleries, each with a subgallery. Looking at the upper gallery (City001), The items property of the outer gallery is a standard Vertical gallery
GroupBy(Filter(Table1,Value(City)=001),"Grid ID","Restofdata")
The label's Text in this gallery is "Grid ID: "&'Grid ID' . Beneath the label is a Horizontal subgallery with an Items property of Restofdata. In the subgallery, there are two labels 'Service ' and beneath it 'Wait time'.
The lower gallery (City002) is a duplicate of the upper one but with the items property
GroupBy(Filter(Table1,City*1=002),"Grid ID","Restofdata")
I believe this is the look you want. However, in order to maintain your requirement that the tables be updated every 10 min. you will need to sort the Table data by wrapping the filter as follows:
GroupBy(Filter(First(Sort(Table1,ID,Descending)),City*1=002),"Grid ID","Restofdata")
A timer control could be used to refresh the connector at the appropriate times. As the data in your table will quickly overwhelm PA's delegation restriction (2000 records) on Last(), Max(), etc, by sorting the data descending and then selecting the First record in the table, you can avoid the delegation problems, even if your table is millions of records. I hope this gives you a start for your design. Please mark the thread as solved if it answers your question.