How to convert ffmpeg adelay filter to ffmpeg-python

I am trying to learn to convert ffmpeg command line adelay filter to ffmpeg-python format.
This is the ffmpeg command line argument

ffmpeg -i first.mka -i second.mka -i third.mka -i fourth.mka
       -filter_complex
         "[1]adelay=184000|184000[b];
          [2]adelay=360000|360000[c];
          [3]adelay=962000|962000[d];
          [0][b][c][d]amix=4"
merged.mka

How to define this filter in ffmpeg-python?

This is what I have tried. I am very new to ffmpeg.

    lk = [60,120] # delay time in seconds
    audios = []
    for k, i in enumerate(audio_file):
            audio = ffmpeg.input(i['src'], select_streams="a")
            if audio['streams'] and i['muted'] == False:
                a = (audio.filter('adelay', f"{i[lk] * 1000}| 
   {i[lk] * 1000}"))
            audios.append(a)
    mix_audios = ffmpeg.filter_(audios, 'amix') if len(audios) > 1 
    else audios[0]