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To use the default serial console available on pin 8 and 10 (GPIO 14 and 15) you have to use a USB to TTL serial adapter. How to connect it and how do configure the RasPi to get the serial console working you can look at What is the correct way to connect serial console on RPi4 Model B?.
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Your ExecStart command line has invalid syntax:
This syntax is inspired by shell syntax, but only the meta-characters and expansions described in the following paragraphs are understood, and the expansion of variables is different. Specifically, redirection using "<", "<<", ">", and ">>", pipes using ...
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