Add variable text (sequential small letters) to query results - google-sheets

Question

I'm getting strings like the following at Col B on Page3 of this sheet:
) Reason1, Name: Bruno (2º OfSC, 3844923); ) Reason1, Name:
Wladimir (3º OfSC, 3693237); ) Reason2, Name: Jorge (9º OfSC,
4715814); ) Reason3, Name: Holden (1º OfSC, 4541195); )
Reason4, Name: John (5º OfSC, 4729589); ) Reason5, Name: Antony
(6º OfSC); ) Reason5, Name: Edson (7º OfSC);
Is there a way to use CHAR(ROW(97)) or lower(regexreplace(address(1,row(A1)),"[^A-Z]","")) into the formula =IFERROR( TEXTJOIN( CHAR(10); TRUE; TRANSPOSE( QUERY(Page2!$A$3:$C; "select C where A <= date '" & TEXT( DATEVALUE(A4); "yyyy-mm-dd") & "' and (B >= date '" & TEXT( DATEVALUE(A4); "yyyy-mm-dd") & "' or B is null)")))) to get the following result?
a) Reason1, Name: Bruno (2º OfSC, 3844923); b) Reason1, Name:
Wladimir (3º OfSC, 3693237); c) Reason2, Name: Jorge (9º OfSC,
4715814); d) Reason3, Name: Holden (1º OfSC, 4541195); e)
Reason4, Name: John (5º OfSC, 4729589); f) Reason5, Name: Antony
(6º OfSC); g) Reason5, Name: Edson (7º OfSC);
I have unsuccessful tried = TEXTJOIN( CHAR(10); TRUE; TRANSPOSE( ARRAYFORMULA QUERY({CHAR(ROW(97)&Page2!$A$3:$C}; "select C where A <= date '" & TEXT( DATEVALUE(A4); "yyyy-mm-dd") & "' and (B >= date '" & TEXT( DATEVALUE(A4); "yyyy-mm-dd") & "' or B is null)"))) on Page3's Col C
Also, it would be great if the formula could be an array!

Answer 1

If you take a look at your sample sheet there is a new tab called MK.Idea.
In it you will find this formula in cell I1:
=ARRAYFORMULA(QUERY(IFERROR(SPLIT(FLATTEN(Page1!E3:E70&", Name:"&Page1!C3:C70&" ("&Page1!D3:D70&IF(LEN(Page1!F3:F70);", "&Page1!F3:F70;)&")|"&Page1!A3:A70+SEQUENCE(1;L2;0)&"|"&TEXT(Page1!A3:A70+SEQUENCE(1;L2;0);"mmmyyyy")&"|"&(1*SUBSTITUTE(Page1!B3:B70;"undefined";TODAY())));"|";0;0));"select Col2,Col1 where Col2<=Col4 and Col3 = "&DATE(A1;A2;1)&" order by Col2 label Col2'Date',Col1'Reason'"))
Which does all of the work directly from the Page1 tab. It does not use anything besides the original data. So Page2 and Page 3 are not necessary.
This formula supplies dynamic dates:
={"Date";SEQUENCE(DAY(EOMONTH(DATE(A1;A2;1);0));1;DATE(A1;A2;1))}
Then an "Filter" type formula built as an arrayformula gets the result.
={"Reasons";ARRAYFORMULA(VLOOKUP(A4:A34;SPLIT(TRANSPOSE(SUBSTITUTE(TRIM(QUERY(QUERY({F:F&"|"\CHAR(10)&H:H&G:G};"select MAX(Col2) group by Col2 pivot Col1");;9^9));" "&CHAR(10);";"&CHAR(10)));"|;"&CHAR(10);0);2;0))}
Here, a copy of the OP's sheet with my solution will live in perpetuity.