nf_nat_proto_gre module missing in kernel 4.18.0-240.22.1.el8_3.x86_64

I can't make PPTP work over RHEL 8.3 with kernel 4.18.0-240.22.1.el8_3.x86_64 .
Apparently modules for GRE protocol are missing from kernel? nf_nat_proto_gre, nf_conntrack_proto_gre.
How can I add missing modules or connect PPTP client over NAT?
Any suggestions are greatly appreciated.