I found a solution:
<%*
const options = ["A", "B", "C"];
const fileNames = { "A": "A", "B": "B", "C": "C" };
const choice = await tp.system.suggester(options, options, false);
if (choice) {
const fileName = fileNames[choice];
tR += await tp.file.include(`[[${fileName}]]`);
}
%>