Hmmm…the first one is basically a PERT chart, correct? I’m not aware of any custom visuals for that in Power BI. This leaves two primary options, R and Charticulator.
There is a package in R called CPMandPERT that allows you to create some fairly highly-customizable PERT Charts.
I’d recommend taking a look at this to see if it will meet your needs:
@MudassirAli or @JarrettM could give you a better sense as to what’s possible in replicating this chart in Charticulator, though I suspect it’s totally doable.
With regard to the bottom chart, you have more options. You could create a home-brewed version of this via the matrix visual using the techniques that @sam.mckay lays out here:
There are also a wide array of custom Gantt visuals, both free and paid, in Appsource that could produce something similar. Some of the paid ones (Xviz and Zebra BI, if I recall correctly) are very highly customizable).
Finally, this one also could also be done in Charticulator. For that, I would refer you to Part 2 of @MudassirAli 's recent Enterprise DNA course on Advanced Visualization Techniques.
I hope this is helpful.