A reasonable report I just read indicates that the virus may cause damage to the heart in different ways. (See link below)

One is that the heart must work harder when the lungs are struggling to provide oxygen.

Mitochondria produce energy molecules for the heart and require certain nutrients including magnesium, coenzyme Q10, L-carnitine, quercetin and, ironically, oxygen.

So I wonder if supplying the required nutrients would support heart function and thus reduce damage?

Magnesium is not hard to supplement since it can come even in liquid form. One just has to avoid causing diarrhea with too much. A starting point would be to scent test and, if not smelling bad, the start at 100 mg.

L-carnitine is mostly available in animal foods so broth could be made – the old chicken soup adage.

Coenzyme Q10 is the most expensive supplement and comes in dosage from 60 to 200 mg and there is controversy over what amount is best. There is a problem scent testing it because many of the supplements come in oil in soft gel caps. This is an issue because of what is in the gel caps but also because traces of the oil on the outside of the caps can go rancid and affect the scent test. If you can find coenzyme Q10 in a dry form then that may be scent tested. Another issue is digesting the oil. Low thyroid or low stomach acid may affect digestion. A third issue is what form of coenzyme Q10 is best for any individual -ubiqinol or ubiquinone? That can be addressed by using a supplement that contains the different tocopherols.

Quercetin has an interesting connection here as I posted to you recently an article about quercetin having anti-viral activity. Hence, quercetin might support heart muscle function but also benefit by supporting the immune system.

Immune system attack on organs may be another issue resulting from Covid-19 so quercetin’s benefit might derive from that as well.
Hope you don’t need this information and are safe and well.