This script will copy the xml chords to regions.

Code:
reaper.Undo_BeginBlock2(0)
reaper.Main_OnCommand(40421,0) --Item: Select all items in track 40421
reaper.Main_OnCommand(40153,0) --Item: Open in built-in MIDI editor (set default behavior in preferences) 40153
take = reaper.MIDIEditor_GetTake(reaper.MIDIEditor_GetActive())
reaper.MIDI_Sort(take)
MIDIOK, MIDI = reaper.MIDI_GetAllEvts(take, "")
tChords = {}
stringPos, ticks = 1, 0
while stringPos < MIDI:len() do
    offset, flags, msg, stringPos = string.unpack("i4Bs4", MIDI, stringPos)
    ticks = ticks + offset
    if msg:byte(1) == 0xFF then
        chord = msg:match("text (.+)")
        if chord then
            tChords[#tChords+1] = {chord = chord, ticks = ticks}
        end
    end
end
tChords[#tChords+1] = {ticks = ticks}
for i = 1, #tChords do
    tChords[i].time = reaper.MIDI_GetProjTimeFromPPQPos(take, tChords[i].ticks)
end
for i = 1, #tChords-1 do
    -- Set Region Color RGB > reaper.ColorToNative(55,118,235)
    reaper.AddProjectMarker2(0, true, tChords[i].time, tChords[i+1].time, tChords[i].chord, 0, reaper.ColorToNative(55,118,235)|0x1000000) 
end
reaper.Undo_EndBlock2(0, "Convert xml chords to regions", -1)


In Reaper Menu > Actions > Show Action List > Reascript > New > Convert xml chords to regions.lua
(this should Save in Reaper Resources\Scripts, to find folder > Options > Show REAPER Resource path..)
copy and paste code below,
select a track from the imported musicxml
in the Reascript window > Ctrl+S to save and run script
close script window
to run the script next time just type the name you save it to in the filter box.
In the script you can change the default region (R,G,B) color > reaper.ColorToNative(55,118,235), to edit the region color right click the region.

To convert the Regions to Text Items Track install ReaPack https://reapack.com/
then Extensions > ReaPack > Browse packages
X-Raym_Create text items on first selected track from regions
right click > Install > Apply
Insert a new track, select it, run > X-Raym_Create text items on first selected track from regions



Attached Files (Click to download or enlarge) (Only available when you are logged in)
Reaper_xml-Chords.png (186.39 KB, 339 downloads)