Is there any guide to migrate terraform resource from waf_rule to ruleset

We have a terraform configuration with provider 3.x, using resource like cloudflare_waf_group and cloudflare_waf_rule
In order to move to provider 4.x, we need to transfer those to cloudflare_ruleset on phase http_request_firewall_managed (upgrade doc)

For the same process for cloudflare_filter and cloudflare_firewall_rule, there is a dedicated page in cloudflare documentation helping this process. Is there similar guidance for waf?

Another aspects is that in play is that we did the migration from cloudflare old managed rules to new managed rules.
Did someone perform similar action on their setup?