SQL Pivot Percent Row Distribution Columns - sql

Question

I am looking for help with writing a query to display percent distribution to display across the values of a row in a pivot in SQL Server.
My data and current query for the pivot is as follows: https://dbfiddle.uk/CgwcAtRU
Existing Query:
SELECT StoreID, Quarter, MonthofYear, WeekOfYear, [0], [1], [2], [3], [4], [5], [6], [7]
FROM (SELECT Sales.StoreID, TimeGrouping, Sales.Quantity, MonthOfYear, Quarter, WeekOfYear
FROM Date INNER JOIN Sales ON Date.DateID = Sales.DateID) AS t
PIVOT (Sum(Quantity) FOR TimeGrouping IN ([0], [1], [2], [3], [4], [5], [6], [7])) p
GROUP BY StoreID, Quarter, MonthofYear, WeekOfYear,[0], [1], [2], [3], [4], [5], [6], [7]]
I am open to changing the existing query, but it provides a starting point of where my thinking was. In this example the results would return the following:
StoreID
Quarter
MonthofYear
WeekOfYear
0
1
2
3
4
5
6
7
1
1
1
2
null
null
null
71.43%
28.57%
null
null
null
2
1
1
2
null
null
100%
null
null
null
null
null
3
1
1
1
null
100%
null
null
null
null
null
null
Query to re-create data:
CREATE TABLE stores
(StoreID int, Location varchar(13), StoreName varchar(8));
INSERT INTO stores
(StoreID, Location, StoreName)
VALUES
(1, 'Miami', 'Joes''s'),
(2, 'Orlando', 'Franks''s'),
(3, 'Florida', 'Joes''s');
CREATE TABLE products
(ProductID int, Name varchar(10), Category varchar(5));
INSERT INTO products
(ProductID, Name, Category)
VALUES
(1, 'Milk', 'Food'),
(2, 'Eggs', 'Food'),
(3, 'Reese''s', 'Candy'),
(4, 'Hershey''s', 'Candy');
CREATE TABLE date
(DateID varchar(10), Year int, MonthofYear int, Quarter int, WeekofYear int, DayOfYear int);
INSERT INTO date
(DateID, Year, MonthofYear, Quarter, WeekOfYear, DayofYear)
VALUES
('1/1/2022',2022,'1',1,1,1),
('1/2/2022',2022,'1',1,2,2),
('1/3/2022',2022,'1',1,2,3),
('1/4/2022',2022,'1',1,2,4);
CREATE TABLE sales
(SaleID int, DateID varchar(10), ProductID int, StoreID int, Quantity int, TimeGrouping int);
INSERT INTO sales
(SaleID, DateID, ProductID, StoreID, Quantity, TimeGrouping)
VALUES
(1,'1/1/2022',4,3,6,1),
(2,'1/2/2022',2,2,6,2),
(3,'1/3/2022',3,1,5,3),
(4,'1/4/2022',2,1,2,4);