Here's really hopeful that the number of J-36s that are to be procured by the PLAAF would be at least double the number of B-21s that are to be procured by the USAF in the coming years...
Even by taking massively supressed annual serial production rates of only 25 to 30 airframes per year from Chengdu AC:
No. of B-21s | No. of J-36s | Years Required (25 units/year) | Years Required (30 units/year) |
100 | 200 | 8 | 7 |
150 | 300 | 12 | 10 |
200 | 400 | 16 | 14 |
250 | 500 | 20 | 17 |
Though, given the expected capabilities of the J-36 as an "air cruiser" that would command large U(C)AV fleets of different types and builds, this could be deemed sufficient.
There's also the J-XDS as well, which is certainly going to be produced in similar if not greater numbers than the J-36 as a "high-med-lo mix" compenent in the PLAAF (maybe as an "air destroyer"?) - Alongside carrier-based variant(s) for the PLAN.