Drawing - automatic balloons generation

Hi community,
I'm working on some drawing standards and I can't find a way to modify the automatic balloons style. I can create a new style, make it the default one (in fact I actually removed the Default style and create a new one, so there's only one balloon style) and it's being used by the automatic balloon function.

However it's very limited because I can't define any other frame than circle or none (but it's the same for other balloons, I know but it's a shame), and the anchor point choice doesn't change much the result. Moreover, I would love to customize the default behavior of that function (automatic balloons generation) in my standard so that it automatically takes the appropriate BOM column (because I already customized my BOM style with other columns like IFC Wall Quantities, or Title, Description...).

Is it possible to customize the behavior of the automatic balloon generation in the standard or somewhere else to meet my goals ?

Is it possible to customize the balloons style as I want (with another frame than circle for instance, with an anchor point that actually changes something) ?

Do I need to create an ER for that ?

I'm working on a private cloud tenant (so 21x FD02).

Your feedback will be much appreciated.

FYI @RD ​​​​​​​@TB ​​​​​​​​​​​​​​