I’m not sure this will work, but try going into your \Aseprite\data\fonts folder, then make a copy of fonts.xml (for backup) then change these two:
<font name="Aseprite"
type="spritesheet"
file="aseprite_font.png">
<fallback font="Unicode" size="8" />
</font>
<font name="Aseprite Mini"
type="spritesheet"
file="aseprite_mini.png">
<fallback font="Unicode" size="6" />
</font>
to
<font name="Aseprite"
type="truetype"
file="Arial.ttf" >
<fallback font="Unicode" size="8" />
</font>
<font name="Aseprite Mini"
type="truetype"
file="Arial.ttf" >
<fallback font="Unicode" size="6" />
</font>
Might have to specify a font size but i’m not sure how, maybe just file=“Arial.ttf” size=“8” and “6” for mini