MP4 VoD video: Add every second a onCuepoint Timestamp.

I am looking for a skilled freelancer to add onCuepoint Timestamps to my MP4 VoD video as separate data. I have specific time intervals for the timestamps that I would like added (every second). The timestamps should be in the format of "YYYY-mm-dd HH:MM:SS".
Possible with Linux bash tool like ffmpeg, Perl, Python, etc.

Ideal skills and experience:
- Experience with video editing
- Proficiency in adding onCuepoint Timestamps
- Ffmpeg

Here is a result with ffmpeg after correct inserted the timestamp.

ffmpeg -i test.mp4 -map 0:2 -c copy -f data - | hexdump -C

...
00000000 02 00 0f 6f 6e 54 69 6d 65 43 6f 6f 72 64 49 6e |...onTimeCoordIn|
00000010 66 6f 03 00 0f 73 74 72 65 61 6d 2d 61 62 73 6f |fo...stream-abso|
00000020 6c 75 74 65 00 00 00 00 00 00 00 00 00 00 00 09 |lute............|
00000030 02 00 0a 6f 6e 43 75 65 50 6f 69 6e 74 03 00 07 |...onCuePoint...|
00000040 70 61 79 6c 6f 61 64 02 00 17 32 30 32 33 2d 30 |payload...2023-0|
00000050 34 2d 31 39 20 30 37 3a 31 38 3a 30 35 3a 34 32 |4-19 07:18:05:42|
00000060 35 00 00 09 02 00 0a 6f 6e 43 75 65 50 6f 69 6e |5......onCuePoin|
00000070 74 03 00 07 70 61 79 6c 6f 61 64 02 00 17 32 30 |t...payload...20|
00000080 32 33 2d 30 34 2d 31 39 20 30 37 3a 31 38 3a 30 |23-04-19 07:18:0|
00000090 36 3a 34 32 35 00 00 09 02 00 0a 6f 6e 43 75 65 |6:425......onCue|
000000a0 50 6f 69 6e 74 03 00 07 70 61 79 6c 6f 61 64 02 |Point...payload.|
000000b0 00 17 32 30 32 33 2d 30 34 2d 31 39 20 30 37 3a |..2023-04-19 07:|
000000c0 31 38 3a 30 37 3a 34 32 35 00 00 09 02 00 0a 6f |18:07:425......o|
000000d0 6e 43 75 65 50 6f 69 6e 74 03 00 07 70 61 79 6c |nCuePoint...payl|
000000e0 6f 61 64 02 00 17 32 30 32 33 2d 30 34 2d 31 39 |oad...2023-04-19|
000000f0 20 30 37 3a 31 38 3a 30 38 3a 34 32 35 00 00 09 | 07:18:08:425...|
00000100 02 00 0a 6f 6e 43 75 65 50 6f 69 6e 74 03 00 07 |...onCuePoint...|
00000110 70 61 79 6c 6f 61 64 02 00 17 32 30 32 33 2d 30 |payload...2023-0|
00000120 34 2d 31 39 20 30 37 3a 31 38 3a 30 39 3a 34 32 |4-19 07:18:09:42|
00000130 35 00 00 09 02 00 0a 6f 6e 43 75 65 50 6f 69 6e |5......onCuePoin|
00000140 74 03 00 07 70 61 79 6c 6f 61 64 02 00 17 32 30 |t...payload...20|
00000150 32 33 2d 30 34 2d 31 39 20 30 37 3a 31 38 3a 31 |23-04-19 07:18:1|
00000160 30 3a 34 32 35 00 00 09 02 00 0a 6f 6e 43 75 65 |0:425......onCue|
00000170 50 6f 69 6e 74 03 00 07 70 61 79 6c 6f 61 64 02 |Point...payload.|
00000180 00 17 32 30 32 33 2d 30 34 2d 31 39 20 30 37 3a |..2023-04-19 07:|
...