Posibility to add custom font style to each element individually

[DevAutomationInf]

Is your feature request related to a problem? Please describe.

It is not possible to add a custom font size to an individual element in the diagram for embedded labels ( such as tasks, lanes, and subprocesses).

Describe the solution you'd like

It should be possible to apply a custom font style inside the custom renderer to embedded labels, as it is possible for external labels.

Describe alternatives you've considered

I considered overriding the renderEmbeddedLabel function inside the BPMNRenderer, but that is not allowed when using typescript.

Additional context

In this stackblitz example, I demonstrate how the external label font size can be changed for each element individually. However, if this property is added to the embed label, only the stroke takes effect. {labelStyle: {fontSize: '40', stroke: 'blue'}}. The cause is that the renderEmbeddedLabel doesn't take other style into consideration. I tried overriding this method but it was not possible when using typescript.

[barmac]

I tried overriding this method but it was not possible when using typescript.

What do you mean by that?

[DevAutomationInf]

I updated the stackblitz project with what I tried. My intention was to change the logic of the method so that the labelStyle is also taken into consideration. I get this error message: 'This member cannot have an 'override' modifier because it is not declared in the base class 'BpmnRenderer'. I tried to add 'ts-ignore' just to see if it works, but the code takes no effect. I think it was not meant to be overridden.

[barmac]

I understand, so you'd like us to refactor the BpmnRenderer in a way to allow overriding of the embedded label rendering. I think this can be useful for broader BPMNLabel properties support. I will move the issue to the backlog, but if you have a proposal how we can solve this in a reasonable way, we are happy to review the PR.

[DevAutomationInf]

Thank you, barmac! Then I will make a PR.