How to make a specific tag's first line bold?

RemNote Learning RemNote
#1 
[data-rem-container-tags~="english"] 
.rem-text span {  
text-align: center;  
font-size: 18px;   
font-weight: bold;
}

Above code makes descendants bold too. Is it possible to make only first line bold for a specific tag?

#2

remove container

[data-rem-tags~="english"] .rem-text span {  
    text-align: center;  
    font-size: 18px;   
    font-weight: bold;
}