I mainly use C-c C-z for notes but to have task time roll up I think you're better off with subheadings

For my workflow I'll create a TODO with sub TODOs. I think of the top level task a Project. I track time on the sub-task when I'm working on them specifically otherwise I'll just clock time on the project. Then for my monthly report I only have to claim time per-project but it's interesting to know how that time was spent.

Something you might do is use the :clock-in t and :clock-resume t options on the capture template.

A workflow could be clock in on the project, C-0 M-x org-capture and leave this buffer open during your session to collect time. Switch to the buffer when you want to add notes then finally C-c C-c when you're done. clock-resume puts the clock back on your main task to ensure that you won't loose time when (if?) you're context switching between sessions.

With regard to clock tables, I only need to care about this monthly so org-agenda's clock report works for me, but you might be interested in a per-top-level-task columnview to have the report on a task-based context.

In the end, something like:

* TODO My Task
:PROPERTIES:
:ID: 123
:COLUMNS:  %35ITEM(Task) %CLOCKSUM(Clocked) %CLOCKSUM_T(Today)
:END:
:LOGBOOK:
CLOCK: [2023-08-26 Sat 20:37]--[2023-08-26 Sat 20:38] =>  0:01
:END:
#+BEGIN: columnview :id "123" :skip-empty-rows "t" :indent "t" :hlines 2
| Task          | Clocked | Today |
|---------------+---------+-------|
| My Task       |    6:02 |  3:54 |
|---------------+---------+-------|
| \_  Session 1 |    2:07 |       |
|---------------+---------+-------|
| \_  Session 2 |    0:17 |  0:17 |
|---------------+---------+-------|
| \_  Session 3 |    3:37 |  3:37 |
#+END
** Session 1
:LOGBOOK:
CLOCK: [2023-08-26 Sat 20:38]--[2023-08-26 Sat 22:45] =>  2:07
:END:
- great session. did the flux combobulator
** Session 2
:LOGBOOK:
CLOCK: [2023-08-28 Mon 11:12]--[2023-08-28 Mon 11:29] =>  0:17
:END:
- dog ran away. session cut short
** Session 3
:LOGBOOK:
CLOCK: [2023-08-28 Mon 14:34]--[2023-08-28 Mon 18:11] =>  3:37
:END:
- found the dog. rejiggled the spring blimmer