Append item with space in a filter

Continuing to the two questions

I create a filter as below to find out all tiddlers of relink::backreferences for C1 have the relink:references and/or title with C2.

[[C1]relink:backreferences[]] :filter[relink:references[]append<currentTiddler>match[C2]]

The filter above is not working for tiddler title with space (e.g. First-Name Last-Name).

How could I append an item with space into a list? Are any other ways to achieve the similar targer?

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