Document Name Filtering to Filter By "include" instead of "starts with"

I have created a Document Name filter for documents uploaded to the current application I'm working on. However, based on how documents are set up in Appian, I am only able to retrieve the document name through Appian's Document ID. I am using a!pickerFieldDocuments() to filter by documents, but the issue is that when I type in the document name it only pulls up results based on what the document name starts with. I would like the document name filter to use partial name searching instead so that instead of having to know what the document name starts with I can just type in any text included in the name to pull up the results. But I am finding this rather difficult to do using Appian's Document ID to retrieve the document's name property. Does anyone know how to resolve this? Thanks.