Scripts

maybe SetMonsterNames? I didn't quite understand the description. It's probably not that, but still...

Yes, that's it, thank you very much :).
Regarding the description:

SetMonsterNames(monsterName, monsterNamesFilter, nameFileRef)

monsterName - the script name of the monster on the map, which is set in the property tree.
monsterNamesFilter - as far as I understand, it specifies whether to set the name for only one monster, a group (if we have an army with additionalStacks), or change both names (?). In the first case, we write MONSTER_NAME_SINGLE, in the second - MONSTER_NAME_MULTIPLE, and in the third (?) - MONSTER_NAMES_ALL. I used the first option for a regular monster, and it works.
nameFileRef - the path to the text file.