I have open-jaw trip booked via Chase, using UR points.
BOS-LHR AA6175 operated by BA 238
CDG-BOS AA147

Both flights are referred to as "Economy".
I was able to choose seats for AA147 online with AA.
For AA6175/BA 238, I have the option to pay for seat selection online with BA.
On the BA website, under flight details, Selling Class is listed as "Q".

Neither AA or BA website offers me upgrade options, that I can find.

My question...
Are there any ways to upgrade either flight to Business, using AA Miles, BA Avios, or additional UR Points?