Hello. I have a pivot query as source of a report

Here's what my issue is:

I have a specific field marked as Column Heading

So what I do is I select all the names from this field and put them as
column heading, for example:

Name1      Name2     Name3   Name4..........
123.23      234.56      2345.7    567.98

However my query will only return the fields that are present.....so if
Name1 and Name2 are in the table then they'll show up in my query, but Name3
and Name4 will not. The problem is that I still ned these
names to show on the report, with a value of at least 0 or - (dash)

The reason is that the data in thwe source table will change, so for example
Field3 and Field4 might get values and need to be automatically showing in
the report. It's not possible for me to track the changes (adding/deleting)
of information to the database and adjust the report that way

So is there a way to show those fields in a report or whatever other way
someone might know? I really really appreciate your help

Thanks,

Leo