Unable to create htb tc classes more than 64K

[Akshat Kakkar <akshat.1984@gmail.com>]

I want to have around 1 Million htb tc classes.
The simple structure of htb tc class, allow having only 64K classes at once.
But, it is possible to make it more hierarchical using hierarchy of
qdisc and classes.
For this I tried something like this

tc qdisc add dev eno2 root handle 100: htb
tc class add dev eno2 parent 100: classid 100:1 htb rate 100Mbps
tc class add dev eno2 parent 100: classid 100:2 htb rate 100Mbps

tc qdisc add dev eno2 parent 100:1 handle 1: htb
tc class add dev eno2 parent 1: classid 1:10 htb rate 100kbps
tc class add dev eno2 parent 1: classid 1:20 htb rate 300kbps

tc qdisc add dev eno2 parent 100:2 handle 2: htb
tc class add dev eno2 parent 2: classid 2:10 htb rate 100kbps
tc class add dev eno2 parent 2: classid 2:20 htb rate 300kbps

What I want is something like:
tc filter add dev eno2 parent 100: protocol ip prio 1 handle
0x00000001 fw flowid 1:10
tc filter add dev eno2 parent 100: protocol ip prio 1 handle
0x00000002 fw flowid 1:20
tc filter add dev eno2 parent 100: protocol ip prio 1 handle
0x00000003 fw flowid 2:10
tc filter add dev eno2 parent 100: protocol ip prio 1 handle
0x00000004 fw flowid 2:20

But I am unable to shape my traffic by any of 1:10, 1:20, 2:10 or 2:20.

Can you please suggest, where is it going wrong?
Is it not possible altogether?

-Akshat