Adjusting a Unique Let Formula to add an additional column/value.

Hello, I am looking to add to this formula.

In the example, I added a unique customer number, that I want to return also in the Let/Filter formula.

=LET(b,FILTER(Table1,Table1[DATE]>TODAY()-30),u,UNIQUE(INDEX(b,,1)),s,SORT(HSTACK(u,MAP(u,LAMBDA(x,SUM(N(INDEX(b,,1)=x)))),MAP(u,LAMBDA(x,SUM(N(INDEX(b,,1)=x)*INDEX(b,,4))))),2,-1),s)

I appreciate any help.

Thank you,
Nick