Visualization, grouping multiple terms to one bar

My goal is to create a vertical bar chart with grouped terms into less bars.

My dataset has about 150 individual unique name.keyword entries and I want to group some of these name.keyword data into one.

I dont have an additional field to group by but I know the names which should be in a group.

For example I want visualize name "xyz", "123", "abc" into one bar. The names dont have anything in common so I want to add it manually if possible.

Is this possible?
Thanks in Advance

I can't think of a way to do that (doesn't mean that there isn't) but do you use logstash? Would it be possible to add an additional field to the documents to make it easier to group?

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