As far as I know, to describe Script Tree with Script Path 1:
<Key1> OP_CHECKSIG <Key2> OP_CHECKSIGADD OP_2 OP_NUMEQUAL
and Script Path 2:
I have to use Taproot expression: tr(InternalKey,{multi_a(2,Key1,Key2),pk(Key3)}), so that the descriptor can be imported into Bitcoin core with private key disabled.
However, for example, if I want to change script path 2 as
OP_10 OP_CHECKSEQUENCEVERIFY OP_DROP <Key3> OP_CHECKSIG
I don't know what kind of expression to use?
tr(InternalKey,{sortedmulti_a(2,Key1,Key2),???)})