DNP3 - filtering and displaying a specific point number?

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If you look at one of the responses with your analog data and expand the packet details pane and then expand the data for any point and select the "Index" element, you'll see in the bottom status bar at the left the name of the filed "Object Index" and in parenthesis the filter name "dnp3.al.index".

Using this you can filter on ANY object in a response with dnp3.al.index == 123 supplying the index number as appropriate.

Unfortunately this will display packets with ANY object type with that index, so you might have to qualify the filter by adding a clause that also requires a specific analog object type, e.g.

dnp3.al.index == 123 && (dnp3.al.ana.int || dnp3.al.ana.float || dnp3.al.ana.double)

which adds the qualifiers of the analog type; int for both 16 bit and 32 bit, float and double. Note that this will also display packets that contain both an analog input and any point with the specified index which still might not be what you require.