[Prince2]

Will twrp recovery available for spd 7731e andoid 10 .

[X3non]

Will twrp recovery available for spd 7731e andoid 10 .

can't say for sure, you'll have to be on the lookout

[benop]

can you root with twrp without unlocked bootloader
on Unisoc phones

[X3non]

can you root with twrp without unlocked bootloader
on Unisoc phones

No, you must unlock bootloader before attempting to flash custom recovery
but you could try flashing a gsi rom with root included using RD tool though and see if it boots (without unlocking bootloader)