Printing a multiline d.text in GRASS-GIS when using Python grass-session

Here is what I’m trying to do, but the text remain printed in one line. What is wrong?

from grass_session import Session
from grass.script import run_command

with Session(gisdb="path to mygisdb", location="myL72",
             create_opts="EPSG:31370") as sess:

    cptxt = "- first line n"
    cptxt += "- second line n"

    run_command('d.text',
                text=cptxt,
                color='grey',
                rotation=0,
                linespacing=1.8,
                at=[2, 45],
                align='ll',
                size=2.5
                )

But the result is - first line - second line.

Any idea?

cptxt = "- first line n"
cptxt += "- second line n"

myfile = 'input_text.txt'

with open(myfile, "w") as ftxt:
    ftxt.write(cptxt)

run_command('d.text',
            input=myfile
            )