There is a way:
Create 12 (half the player cap) "bot_generator" entities, name them blue_bot_generator and set them so that they spawn only Blue bots.
Create a "logic_auto" and add the following Output {OnMultiNewMap blue_bot_generator SpawnBot}.
Create a "info_player_teamspawn" for the Blue team.
That's it, sadly the spawned bots don't work as intended when spawned like this, the bot_generator input RemoveBots doesn't do anything, and the bots will always spawn at the info_player_teamspawn (even if you set -No- to <Use Team Spawn Point>).